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Aim and Background: The coronavirus disease 2019 (Covid-19) virus pandemic is still ravaging the world with its ongoing resurgence and the continuous mutation, suggesting the need for continuous research on safe and effective novel vaccines. Presently several types of vaccines have been developed and emerged in the global market to control COVID-19 virus. Consequently, the knowledge and information on COVID-19 have been expanding at a high level. Researchers need to gain relevant knowledge regarding the different vaccines;however scattered information makes this process time-consuming and laborious. The present study aimed to evaluate the characteristics and trends in global COVID-19 vaccine high-cited literature using bibliometric and visualizations methods and offer some directions and suggestions for future research. Methodology: Studies published between December 2019 and 22 Nov 2022 on COVID-19 vaccines were retrieved from the Scopus database. From the 16026 studies retrieved, 406 were identified as high-cited papers (HCPs) having received 100 or more citations. From the 406 HCPs, information about publications outputs, countries, institutions, journals, keywords, and citation counts was identified. Data analysis and visualization were conducted using Microsoft Excel, VOSviewer and Bibliometrix R software. Result(s): The 406 global HCPs on COVID-19 vaccines research were identified in Scopus database since Dec 2019 till 30 Nov 2022 using a search strategy, which received 123614 citations, averaging 304.17 citations per publication (CPP). An external funding was received by 53.20% (216 publications), which were cited 76107 times (with an average of 352.35 CPP). The 7086 authors from 694 organizations affiliated to 76 countries and publishing in 121 journals were involved in global COVID-19 vaccine research. The most productive countries were USA (n=213), U.K (n=91), China (n=36) and Germany (n=35). The most impactful countries in terms of citations per paper (CPP) and relative citation index (RCI) were South Africa (794.68 and 2.61), Germany (507.11 and 1.67), U.K. (396.59 and 1.30) and Spain (367.5 and 1.121). The most productive organizations were University of Oxford, U.K., Imperial College London, U.K. (n=25 each), Center for Disease Control and Prevention (CDC), USA and Tel Aviv University (n=19 each) and the most impactful organizations were University of Cambridge, U.K (783.4 and 2.57), Emory University, USA (780.1 and 2.56), John Hopkins Bloomberg School of Public Health, USA (702.67 and 2.31) and National Institute of Allergy and Infectious Diseases. USA (676.41 and 2.22). The most productive authors were A.J. Pollard (n=16) and T. Lambe (n=14) (of University of Oxford), O. Tureci and P.R. Dormitzer (n=12 each) (of BioNTechSE, Germany) and the most impactful were D. Cooper (1239.22 and 4.07), K.J. Janseu (1228.11 and 4.03) (BioNTechSE, Germany, K.A. Swanson (987.0 and 3.24) (University of Oxford, U.K.) and P.R. Dormitzer (983 and 3.23) (BioNTechSE, Germany). The most productive journals were New England Journal of Medicine (n=53), The Lancet (n=28), Nature (n=22) and JAMA (N=17). The most impactful journals (as per citations per paper) were New England Journal of Medicine (613.15), Lancet (496.39), Human Vaccines and Immunotherapeutics (369.67) and Nature (360.64). Among population age groups, the major focus was on adults (51.48%) and Middle Aged (39.16%). Among publication types, the major focus was Clinical Studies (26.85%), Epidemiology (22.66%) and Genetics (21.92%). The most significant keywords by frequency of appearances were "Covid-19" (n=388), "Covid-19 Vaccines" (n=357), "Vaccination" (n=221), "Prevention and Control" (n=181) and "Vaccine Immunogenicity" (n=133), Conclusion(s): The HCPs in COVID-19 vaccine research was done mainly by the authors and institutions of high-income Countries (HIC) and was published in high-impact medical journals. Our research has identified the leading countries, institutions, journals, hotspots and development trend in the field that could provide the foundati n for further investigations. The bibliometric analysis will help the clinicians to rapidly identify the potential collaborative partners, identify significant studies, and research topics within their domains of COVID-19 vaccines.Copyright Author (s) 2023.
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Objectives: The study makes a bibliometric evaluation of global publications on "Application of Stem Cell Therapy to Covid-19" during 2020-22.
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Background: Mucormycosis is an invasive fungal infection that has shown a surge during the COVID-19 pandemic. A comprehensive assessment of COVID-19 associated mucormycosis (CAM) research is lacking.
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The study aims to evaluate global research output (103054 records) on coronavirus disease (COVID-19) based on quantitative and qualitative indicators. It presents a bibliometric profile of most influential countries, organizations, authors and journals and their collaborative linkages, besides identifying broad subject areas of research, most significant keywords and highly-cited papers related to COVID-19. During 2020-21, more than 150 countries participated in COVID-19 research, of which top 10 countries accounted for a 82.93% global share. The USA, China and U.K. produced the most articles (25.86%, 10.77% and 10.7% respectively). The top three organizations, namely Harvard Medical School, USA, Huazhong University of S&T, China and Tongji Medical College, China contributed 1755, 1344 and 1267 papers, respectively. The most cited organizations in COVID-19 research are: Peking Union Medical College, China (97.41 CPP), University of Hong Kong (82.17 CPP) and Renmin Hospital of Wuhan University, China (59.88 CPP). The top three most productive authors are: V. Wanitlit, E. Mahase and G. Lacobucci (with 152, 135 and 108 papers). The top three most cited authors in terms of citations per paper (CPP) are: Y. Hu (319.82), L. Liu (303.91) and J.F.W. Chan (169.55). The most productive organizations originate from most productive countries and they contribute the most collaborative papers. The top three journals, namely International Journal of Environmental Research, BMJ and PLOS One contributed 961, 854 and 781 papers, respectively. The top three journals in terms of citations per paper (CPP) are New England Journal of Medicine (122.78), The Lancet (106.3) and JAMA (75.17). The most ubiquitous topic was COVID-19 clinical studies, with maximum focus on virological aspects (9.58%), respiratory aspects (6.97%), molecular aspects (3.11%), genetic aspects (3.09%) and immunological aspects (1.3%). The results of this study should be of interest to working scientists, clinicians and policy-makers in improving their understanding of COVID-19 disease and in its management.
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The study evaluates the global research output (820 records) on "Use of Convalescent Plasma Therapy for COVID-19" on metrics with the aim to understand the current status of research at the global, national, institutional, and individual author level. The study is based on publications and citations data sourced from the Scopus database during 2020-21. The publications and citations data was statistically analyzed on various metrics such as document type, country of publication, collaboration patterns, author affiliation, journal name, and citation patterns. The USA, China and India lead the world ranking of 15 most productive countries in the subject. China, U.K. and Netherlands lead in the ranking of most cited countries. In addition, the study maps key productive institutions, key authors, key source journals, as well as most significant keywords in the subject to visually present their inter-relationships using Biblioshiny and VOSviewer software. This results and findings from the study describe the progress made by the world in this hot area of global interest.
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The paper presents a analysis of quantitative and qualitative dimensions of global research output (3488 records) on "Impact of COVID-19 on Children and Adolescents", based on indexed publications in Scopus database. The global publications on this theme averaged 8.31 citations per paper. About 1.49% share of its total publications in this area received external funding support. The 145 countries partcipitated in global research output on "Impact of COVID-19 on Children and Adults", of which the top 10 countries accounted for 85.21% and more than 100% share of global publications and citations. The USA, U.K. and Italy leads in global publications ranking and productivity as against China (3.16), U.K (1.28) and USA (1.27) leading in terms of relative of relative citation index. The 412 organizations and 661 authors participated in global research on this theme, with top 15 most productive organizations and authors contributing 21.07% and 4.30% global publications share and 38.05% and 12.98% global citations share. Harvard Medical School, USA, Huazhong University of Science and Technology, China and Tongji Medical College, China leads the world as the most productive organizatons (with 480, 67 and 63 publications) and Huazhong University of Science and Technology, China (31.97 and 3.85), Tongji Medical College, China (19.92 and 2.40) and Children Hospital of Philadelphia, USA (19.30 and 2.32) leading as the most impactful organizations in the world in terms of citation per paper and relative citation index. D. Buonsensov, C. Calvo and X. Lu were the most productive authors (with 15, 12 and 12 papers) and X.Lu (103.83 and 12.49), A. Licari (40.11 and 4.83) and G.L. Marseglia(34.09 and 4.1) were the most impactful authors. JAMA Pediatrics, Pediatrics Infectious Disease Journal and Acta Paediatrica International Journal of Pediatrics were the most productive journals (with 71, 60 and 58 papers) and Pediatrics (36.59), JAMA Pediatrics (19.49) and Acta Paediatrica International Journal of Pediatrics (14.93) were the most impactful journals.
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Aim:This study aimed to assess the characteristics and trends of research on substance use and COVID-19.Methods:Keywords related to ?Covid-19? and ?Substance Use? were used in a search query formulated for the Scopus search engine. The articles published during the years 2020 and 2021, through early November 2021, were considered.Results:A total of 2184 publications were published on this topic, averaging 9.69 citations per paper. About one-seventh (13.96%) share of global publications was supported by extramural funding support. The maximum number of publications emerged from the United States of America (USA) (n = 831;38.05%), followed by the United Kingdom (UK) (n = 212;9.71%), India (n = 165;7.55%), and Canada (155 papers;7.10%). In terms of citation impact, publications emerging from China (24.42 and 2.52) had the highest citation impact, followed by publications emerging from Australia (18.83 and 1.94), France (16.48 and 1.70), the UK (15.44 and 1.59), Italy (13.36 and 1.38), and Canada (12.73 and 1.31). When the data in terms of specific institutes were evaluated, Harvard Medical School, USA (n = 52), was ranked first in productivity, followed by the University of Toronto, Canada (n = 47);the Yale School of Medicine, USA (n = 35);INSERM, France (n = ?29);and the University of British Columbia, Canada (n = 2s). The University College London, UK (30.24 and 3.12), ranked first in citation impact, followed by INSERM, France (22.0 and 2.27);the Sapienza University of Rome, Italy (17.4 and 1.8);and the University of Toronto, Canada (13.68 and 1.41). When the journals were evaluated, the International Journal of Environmental Research and Public Health (n = 83) ranked first in publication productivity, followed by the Journal of Substance Abuse Treatment (n = 73), Frontiers in Psychology (n = 39), Drug and Alcohol Dependence (n = 28), and International Journal of Drug Policy (n = 26).Conclusion:This bibliometric study suggests that a large amount of literature has accumulated during the COVID-19 pandemic on substance use disorders, both from developed and developing countries.
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Objectives: The study presents a bibliometric assessment of COVID-19 vaccine research publications to understand the current and up-to-date scenario of COVID-19 vaccine research and to track important research players and identify the current areas. Materials and Methods: The global literature on COVID-19 vaccine research published during 2020 were searched in the Scopus database, using the keywords "COVID-19 vaccine" or "Coronavirus 19 vaccine" on 12 September 2020. The 343 global records on COVID-19 vaccine research were obtained which received 2636 citations and were published in 66 countries involving 280 organizations, 259 authors and 191 journals. The publication records obtained were statistically analyzed by using various bibliometric indices: document type, country, collaboration patterns, affiliation, journal name, and citation patterns. Results:Among top 12 countries, USA, U.K and China were the most productive and China, South Korea and USA were the most impactful. Nearly 51% publications of these top 12 countries were international collaborative. The top most productive organizations were Harvard Medical School, USA (12 papers), University of Washington, Seattle, USA (10 papers) and Fudan University, China (with 12, 10 and 8 papers. Th. top most impactful organizations in terms of citation per paper and relative citation index were Tongji Medical College, China (56.0 and 7.28), Shanghai Medical College, China (33.2 and 4.32) and Chinese Center for Disease Control and Prevention, China (23.5 and 3.06). The most productive journals were Nature, Science and Vaccine (24, 18 and 18 papers each) and the most impactful journals in terms of citations per paper were: Journal of Medical Virology (66.5), Cell (27.2) and New England Journal of Medicine (23.4). Conclusion: This results and findings emerging from the study shed new light on the major progress in the present time on hot topics on COVID-19 vaccine research.
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Background: Diabetes is a common co-morbid condition that influences morbidity and mortality in patients with COVID-19 and has been a focus of intense research. However, a systematic assessment of global diabetes research concerning COVID-19 is unavailable. Aim: We aimed to provide a bibliometric assessment of research output on diabetes concerning the COVID-19 pandemic. Materials and Methods: Publications on diabetes in relation to COVID-19 were retrieved from the Scopus database and analyzed using appropriate bibliometric indicators. Results: The publications indexed till January 6, 2021 numbered 762. The share of the top 10 of the 82 countries was 90.6%. The USA, China, India, Italy, and the UK were the most productive countries, with publication share ranging from 11.4% to 17.8%. Brazil, China, Germany, Australia, France, and India registered higher publication impact. The average citations per paper were 7.3, and 19.4% of the publications were funded. The share of publications on type 2 diabetes, type 1 diabetes, and gestational diabetes was 23.2%, 16.5%, and 4.1%, respectively. Diabetic complications, clinical studies, and epidemiology were the most researched aspects of diabetes concerning COVID-19, with 47.9%, 23.3%, and 14.0% share, respectively. Publications on pathophysiology numbered only 93 (12.2%). The most productive organizations were Tongji Medical College, China, Huazhong University, China, Postgraduate Institute of Medical Education and Research, India, and INSERM, France. Obesity and Cholesterol Foundation, India, Imperial College, UK, and The Central Hospital of Wuhan, China were the most impactful organizations. R. Pal, A. Ceriello, and B. Cariou were the most productive authors, whereas A. Misra, R. Gupta, and A.K. Singh were the most impactful. The most active journals were Diabetes Research and Clinical Practice, Diabetes and Metabolic Syndrome: Clinical Research and Reviews, Journal of Diabetes Science and Technology, and Diabetes Care. Conclusion: Extensive high-quality research has been conducted on diabetes in relation to the COVID-19 pandemic in developed and developing countries. There is a need to focus on pathophysiological studies to elucidate further the underlying mechanisms that predispose COVID-19-affected diabetes patients to severe disease and death. Our scientometric assessment may help understand the research gaps and guide future research in this field.
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Background: As the Covid-19 pandemic increased exponentially across the globe, it has threatened the human lives and uprooted the economy of various cities and nations, besides having a major impact on the environment. In a matter of a few months, the world has transformed its way of living. The global disruption caused by the Covid-19 has brought about several effects on the environment and climate. Hence, a scientometric study of the India's publications in impact of Covid-19 on environment has been conducted to identify the emerging research trends in this field. Methods: The study downloaded India's publications on this topic from the Scopus database using a well-defined research strategy, which was based on using all keywords related to Covid-19 in "Keyword" and "Title" search tags of Scopus database. The search was subsequently restricted to "Environmental Sciences" subject, and limited to "India" yielding 805 records. Results: The 805 Indian publications were published on `Covid-19 and Environmental Sciences" as searched in Scopus database and these have received 8275 citations, averaging 10.28 citations per paper. The 30.19% and 36.64% share of India's publications received external funding support and involve international collaboration. Among India's foreign collaborating partner countries, USA contributed the largest share (27.80%), followed by U.K. (21.02%), China and Saudi Arabia (14.24% each) and Australia (13.9%). Among 380 participating organizations, Datta Meghe Institute of Medical Sciences, Nagpur, Indian Institute of Technology, Kharagpur and Academy of Scientific and Innovative Research, New Delhi contributed the largest number of papers (31, 26 and 26 papers) and Indian Institute of Technology, New Delhi (47.5 and 4.68), Karunya Institute of Technology and Sciences (28.29 and 2.79) and Indian Institute of Technology, Gandhinagar (19.75 and 1.95) registered the largest citation impact. Among 945 participating authors, M. Kumar, S. Gautam and R. Kumar contributed the largest number of papers (25, 13 and 10 papers) and A. Narayanasamy (61.17 and 6.03), S. Gautam. (30.46 and 3.0) and M. Joshi (27.29 and 2.69) registered the largest citation impact. Indian Journal of Forensic Medicine and Toxicology, Science of the Total Environment and Environmental Science and Pollution Research contributed the largest number of papers (76, 60 and 45 papers) and Environmental Pollution (12.0), Aerosol and Air Quality Research (11.12), Modeling Earth Systems and Environment (10.50) registered the largest citation impact of paper. The most significant keywords associated with "Covid-19 and Environmental Science" along with their frequency are: Air Quality (124), Air Pollution (96), Particulate Matter (91), Atmospheric Pollution (65), Environmental Monitoring (52), etc. Conclusion: The results of the present study are focused on evaluation of the India's contribution, focusing on both national and international issues using quantitative and qualitative methods. Such a study has allowed us to visualize the research trends that emerged during the Covid-19 pandemic and will facilitate the researchers to identify significant hotspots and latest trends in the field.
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Purpose: The Covid-19 pandemic has significantly impacted world healthcare, with ophthalmology being one of the most severely affected area. The study aims to perform a bibliometric analysis of global literature published on "Ophthalmic Manifestations of Covid-19" to explore the scientific productivity and trends in research in this field. Methods: Bibliometric methods have been used to analyze global literature on this topic using quantitatively and qualitatively indices from the Scopus database up to 20th September 2021. The keywords related to "Covid-19" and "ophthalmology" are used in search strategy through the boolean operator. Primary data were exported in CSV and BibTxt file format for further analysis using different software. The literature on "Ophthalmic Manifestations of Covid-19" was assessed using a variety of metrics. Results: A total of 3453 publications were published on "Ophthalmic Manifestations of Covid-19", which received 32935 citations, averaging 9.54 citations per paper. Of the total publications, 557 received external funding support and registered 10802 citations. The U.S.A. and India published the most significant number of papers among countries. The U.S.A. and U.K. occupied the top position in international collaborative publications. Medicine and Neurosciences were the most productive areas. The Indian Journal of Ophthalmology is the most productive source. A total of 46 high-cited papers have been identified on this topic, which are published in 35 journals, with the U.S.A. contributing the most papers. Conclusion: In this study, the bibliometric assessment presents a quantitative and qualitative matrix of research in the field "Ophthalmic Manifestations of Covid-19". The study gives proof of the enhanced global collaboration that global researchers have created in order to combat the epidemic. The authors have used various bibliometric metrics and tools to present this study efficiently. This study will be helpful for the scholars who were researching in this field.
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Background: Covid-19 is a significant global health burden. The pulmonary morbidity and mortality of Covid-19 is well described, however, there is mounting evidence of neurological manifestations of SARS-CoV-2, which may be of paramount significance. This paper provides a bibliometric assessment of global literature of the peripheral and central neurological manifestations of Covid-19, using bibliometric methods. Methods: The study downloaded publications on this topic from the Scopus database using a well-defined research strategy. The search strategy was initially based on using different keywords related to Covid-19 in "Keyword" and "Title" search tags of Scopus database. The search was subsequently restricted to "Neurosciences" subject, yielding 5245 global records. Results: The 5245 global publications were published on `Covid-19 and Neurosciences" as covered in Scopus database and they have received 5245 citations, averaging 13.46 citations per paper. Of these 5245 publications, 24.54% (1287) received external funding support from 150+ agencies and averaged 20.17 citations per paper. 160 countries participated in global research on this topic, with USA, U.K. and Italy contributing the largest publication share (26.43%, 12.14% and 10.51%) and China (23.8 and 1.78), Spain (9.13 and 0.68) and Italy (8.56 and 0.64) registering the highest citation impact, based on citations per paper and relative citation index. "Adults", among population age groups, contributed the largest share (30.31%), followed by "Aged" (9.48%), "Middle Aged" (9.02%), "Children"(4,73%) and "Adolescents" (2.71%). "Stroke", "Multiple Sclerosis" and "Headache" among type of neurological diseases impacted by Covid-19, contributed the largest global publication share (6.31%, 6.22% and 6.06%), followed by "Seizure", "Parkinson's Disease", Cerebrovascular Accident", "Anosmia", "Guillain-Barre Syndrome" and "Epilepsy" (from 4.39% to 5.62%), etc. "Clinical Studies", among various types of research, contributed the largest publication share (29.38%) in total output impacted by Covid-19, followed by "Complications" (16.03%), "Treatment" (13.99%), "Pathophysiology" 12.18), "Risk Factors"(10.79%), "Epidemiology" (9.38%) and "Genetics". Among participating organizations, Harvard Medical School, USA, University of Toronto, Canada and INSERM, France contributed the largest output (with 142, 101 and 99 papers) and University of Cambridge, U.K. (72.97 and 5.46), King's College London, U.K. (49.97 and 3.74), University College London, U.K. (47.58 and 3.56) registered the largest citation impact. Among participating authors, J. Sterer (24 papers), F.A. Scorza (20 papers) and E. Moro (14 papers) contributed the largest number of papers and Z. Liu (169.7 and 12.7), M.L.R. Neto (54.92 and 4.11) and G. Tsivgoulis (45.54 and 3.41) registered the highest citation impact. Among journals participating on this theme, Psychiatry Research (311 papers), The Lancet Psychiatry (175 papers) and Frontiers in Neurology (172 papers) contributed the largest number of papers and Brain, Behavior and Immunity (61.35), The Lancet Psychiatry (54.58) and Nature Human Behavior (44.37) registered the largest citation impact per paper. Conclusion: This paper evaluates the rapidly evolving literature on the neurological manifestations of Covid-19, which will help to inform and improve decision-making among physicians treating Covid-19 and scholars conducting research on this area. It will also aid in the recognition of significant extra-pulmonary manifestations of the disease among attending front-line clinicians and consulting neurologists and also help them in understanding the pandemic's broader impact on chronic disease management.
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Background: The Covid-19-related diabetes research is confined mainly to type 2 diabetes. Although type 1 diabetes (T1D) which presents unique challenges in Covid-19, appears to be well-researched, a bibliometric assessment of this research is lacking. Materials and Methods: Using a defined search procedure, we identified publications on Covid-19-related T1D research in Elsevier's Scopus database during 2020-2021. The data was analyzed using appropriate bibliometric tools. Results: The publications numbered 255 until August 4, 2021. Seventy-three (28.6%) were funded;these received higher average citations than non-funded (19.0 versus 9.8). The share of publications by age group was as follows: adults (36.8%), children (34.9%), adolescents (27.0%), middle-aged (15.7%), and elderly (10.6%). Sixty-nine countries participated;the USA, Italy, and UK led in productivity, whereas Canada, UK, and Italy were the most impactful. Barbara Davis Center, USA, University of Colorado, USA, and King's College London, UK were the most productive, whereas the University of Glasgow, UK, PGIMER-Chandigarh, India, and Barbara Davis Center, USA were the most impactful organizations. USA's Q. Ebekozien and Italy's C. Maffeis and R. Schiaffini led in productivity, whereas Italy's A. Avogaro and India's S. Bhadada and R. Pal led in impact. Diabetes Research and Clinical Practice and Diabetes Care were the leading journals. Only 12 (4.7%) publications were highly-cited. Conclusion: Covid-19-related T1D research has primarily been conducted in high-income countries such as the USA, UK, and Italy. There is a need to foster collaboration between high-income and low-income countries for further research to develop better management strategies for worldwide patients with the double scourge of T1D and Covid-19.
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Background: Several studies have examined Vitamin D deficiency (VDD) and the effects of vitamin D therapy in patients with coronavirus disease 2019 (Covid-19). However, a bibliometric assessment of research output on VDD in relation to Covid-19 is unavailable. Materials and Methods: We searched Elsevier's Scopus database for publications on VDD in Covid-19 using a defined search strategy. Data pertaining to the growth of publications, citation metrics, the most active countries, institutions, authors, journals, and the most cited articles, were analyzed using appropriate bibliometric tools. Mapping of keywords was done to identify the research trends. Results: Of 435 global publications on VDD in Covid-19, 187 (42.9%) were original articles. The total and average citations per paper (CPP) were 5664 and 13.0, respectively. Eighty-eight (20.2%) publications were funded;the National Institute of Health, USA, was the leading funding agency (n=18). Seventy-four countries participated in research on this theme;the USA and Italy with 18.3% and 16.5% led in productivity, whereas Ireland and the USA were the most impactful. The most dominant research topic was "Risk Factors" with 29.6% share, followed by "Epidemiology" (27.3%), "Complications" (26.4%), "Clinical studies" (24.8%), and "Pathophysiology" (17.2%), only 14.0% studies were on "Treatment". The research patient populations were "Adults", "Aged," and "Middle-Aged," with 24.1%, 21.6%, and 17.7% share, respectively;only 6.4% studies involved children. The organizations and authors numbered 254 and 383, respectively;Trinity College, Dublin, Ireland, and Harvard Medical School, USA, were the most productive, whereas St. James's Hospital, Ireland, and University Hospital Brigham, UK were the most impactful. Belgium's Delanghe and Ireland's Kenny were the top productive authors, and Grant (USA) and Laird (Ireland) were the most influential. Journal of Medical Virology and Endocrine lead productivity while Aging Clinical and Experimental Research and Diabetes and Metabolic Syndrome: Clinical Research and Review lead in impact. Conclusion: The research on VDD in relation to Covid-19 has primarily been conducted in high-income countries, with the USA, Italy, and UK accounting for almost 50% of total publication output. The research gaps appear to be treatmentrelated aspects and VDD in children with Covid-19. Our assessment of the current status of research on VDD in Covid-19 may help the research community and policy-makers to prioritize research needs in this field.
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Introduction: A bibliometric assessment of coronavirus disease 2019 (Covid-19)-related thyroid research is unavailable. Materials and Methods: We searched Elsevier's Scopus database for publications on Covid-19 and thyroid disease up to August 18, 2021, using a predefined search strategy. The data were analyzed by publication characteristics, the most active countries, institutions, authors, journals, citations, and research trends. Results: The global publications totaled 599;446 (74.4%) were original articles. Only 18.0% (108) were funded, but these received higher citations per paper (CPP) than the non-funded publications (average CPP 14.8 versus 9.8). Of the 97 countries that participated in the research, the USA, Italy, India, and China were the most productive, whereas China, Germany, UK, and the USA were the most impactful. The studied patient population groups were "Adults" (50.5%), "Middle-Aged" (33.7%), "Aged" (29.3%), "Children" (7.8%), and "Adolescents" (6.5%). The research organizations and authors numbered 272 and 404, respectively. The most productive organizations were Universita Degli Studi Napoli, Italy, Harvard Medical School, USA, and Universita Degli Studi Milano, Italy. The most productive authors were G. Troncone, L. Glovanella, and G. Anedda. The top productive journals were Endocrine, Journal of Endocrine Investigation, and Frontiers in Endocrinology. Only 22 (3.6%) were highly-cited (average CPP 141.8). Conclusion: The Covid-19 research concerning thyroid disorders has been largely conducted in the USA and Europe with contributions from China and India. There is a need to foster collaboration between high- and low-income countries for formulating better strategies to tackle thyroidrelated morbidities in Covid-19. Additionally, such research should involve younger age groups.
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Background: Many patients with Covid-19 have underlying cardiovascular disease or develop acute cardiac injury during the course of the illness. Adequate understanding of the interplay between Covid-19 and Cardiovascular disease is required for optimum management of these patients. The study analyzed and evaluated the global publication output on "Covid-19 and Heart Diseases" to find out the current trends and present status of research, by identifing important countries, organizations, authors and journals and important topics and keywords from the global publications, using bibliometric methods. Methods: Relevant published literature from December 2019 to August 2021 were identified and analyzed on the topic "Covid-19 and Heart Diseases" using a well-defined search strategy in Scopus database. A list of keywords were identified for Covid-19 ("Covid 19" or "2019 novel Coronavirus" or "Coronavirus 2019" or "Coronavirus disease 2019" or "2019-novel CoV" OR "2019 ncov" or "Covid 2019" or "Covid19" or "Corona virus 2019" or "ncov-2019" or "ncov2019" or "nCoV 2019" or "2019-ncov" or "covid-19" or "Severe acute respiratory syndrome coronavirus 2" or "SARS-CoV-2") and Heart Diseases (cardi* or arrhythmia or myocardial* or heart*) and these keywords are used for search in "Keywords" and Title" tags of Scopus database, yielding 5298 records. Results: A total of 5298 relevant publications indexed in Scopus database were obtained on "Covid-19 and Heart Disease", which received 62459 citations, averaging 11.79 citations per paper. The total publications witnessed the participation of 123 countries, with USA, Italy, U.K. and China leading in global publication productivity (with 1757, 707, 551 and 413 papers) and China (35.31 and 2.99), France (23.01 and 1.95), Germany (23.0 and 1.95) and Italy (20.43 and 1.73) leading in citation impact per publication and relative citation index. The 1761 organizations and 2499 authors participated in these 5298 publications. Harvard Medical School, USA, Brigham and Women's Hospital, USA and Massachsetts General Hospital leads in publications productivity (with 178, 92 and 92 publications each) and New York Presbyterian Hospital, USA (121.53 and 10.31), Tongji Medical College, China (65.65 and 5.57) and Huazhong University of Science and Technology, China (65.41 and 5.55) leads in citations impact per paper and relative citation index. M. Metra, A. Harky and M.K. Chung leads in publications productivity (with 23, 22 and 153 papers each) and G.Y.H. Lip (U.K.)(114.67 and 9.73), A.J. Kirtane (USA)(109.67 and 9.3) and M. Metra (Italy)(87.04 and 7.38) leads in citations impact per publication and relative citation index. European Heart Journal, Circulation and Stroke leads in publication productivity (with 85, 81 and 73 publications) and JAMA Cardiology (154.23), Journal of the American College of Cardiology (54.99) and Circulation (43.54) leads in citation impact per paper. Major keywords appearing along with "Covid-19 and "Heart Diseases" in co-occurnces were "Cardiovascular Disease" (1176), "Heart Failure" (802), "Hypertension" (664), "Cerebrovascular Accidents" (659), "Stroke" (608), "Mycarditis" (511), "Heart Arrhytthrmia"(464), etc. Conclusion: The study presents the current trends and status of research in the field and indicate the important keywords where research is focused in global literature on cardiovascular manifestations in Covid-19 patients. Such a analysis tmay be useful to the research community and decision-makers to prioritize research needs and identify leading Covid-19 researchers, countries, institutes and authors.
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The paper examines global research output (1656 records) on "Impact of Covid-19 on Sleep Disorders", based on publications indexed in Scopus database. The global publications on this theme averaged 15.05 citations per paper. About 19.02% share of its total publications on this theme received external funding support and averaged 34.59 citations per paper. Ninety five countries unevenly partcipitated in global research output on "Impact of Covid-19 on Sleeping Disorders", of which the top 10 most productive countries accounted for 87.62% and more than 100% share in global publications and citations. The USA, China and Italy led in global publications ranking and productivity as against China (2.52), U.K.(2.26) and Italy (1.67) leading in terms of relative citation index.The 527 organizations and 773 authors participated in global research on this theme, with top 15 most productive organizations and authors contributing to 21.62% and 6.28% global publications share and 63.70% and 56.20% global citations share. Huazhong University of Science & Technology, China, and Tongji Medical College, China and Harvard Medical School, USA were the most productive global organizations (with 40, 38 and 33 papers) and Capital Medical University, China (153.85 and 10.22), Wuhan University, China (109.33 and 7.26) and Renmin Hospital of Wuhan University, China (108.10 and 7.18) were the leading most impactful organizations in terms of citation per paper and relative citation index. Z. Liu, S. Grover and G. Wang were the most productive authors (with 9, 8 and, 8). L.Kang (395.17 and 26.26), Y. Wang (395.17 and 26.26) and, S. Ma (322.0 and 21.4) were the most impactful authors. International Journal of Environment Research & Public Health, Sleep Medicine and Frontiers in Psychiatry were the most productive journals (with 73, 69 and 49 papers). Brain, Behavior & Immunity (86.04)., Asian Journal of Psychiatry (46.78), Psychiatry Research (41.15) were the most impactful journals.
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Aim:The paper assesses the India's research output on "Impact of Covid-19 on Mental Health" indexed in Scopus database. Materials and Methods: The Scopus database was used to search for the articles published from India. Results: The search showed that since the onset of the pandemic upto 24th of April 2021, 1210 publications emerged from India, amounting to 6.87% share of the global output on the topic and averaged 5.97 citations per paper. India stood at 5th position in terms of number of publications on mental health, with highest number of publications emerging from United States (26.9%), followed by United Kingdom (13.35%), China (9.83%) and Italy (8.27%). About one-third (30.91%) of the publications involved international collaborations, with maximum number of collaborations were with United States, followed by United Kingdom, Australia, Italy, Canada, and Brazil. The most common keywords in the research included, 'mental health', followed by 'anxiety' and 'depression'. The research output came from 478 organizations, with maximum research coming from National Institute of Mental Health and Neuro Sciences (NIMHANS), Bangalore, All India Institute of Medical Sciences (AIIMS), New Delhi and Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh. About three-fourth (76.85%) of the mental health research emerged from institute other than these 3 institutes. Five out of the 10 most productive authors and 5 out of the most impactful authors were from institutes other than the 3 major institutes. Conclusion: To conclude, this bibliometric analysis suggest that, researchers from India contributed to about 7% of the global mental health research on Covid-19 and India stood at 5th position among the various countries in terms of global mental health research on Covid-19.
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Covid-19 infection, which emerged in late 2019, spread across the world rapidly and was declared as a pandemic on 24th March 2020 by the World Health Organization. Besides other implications, Covid-19 pandemic led to significant mental health issues in the general public, those infected with the virus and the health care workers. Over the period of 15-16 months, a significant amount of literature has emerged on the mental health issues in the context of Covid-19 pandemic. This paper aims to evaluate the research trends in mental health related to Covid-19 infection by using the bibliometric analysis. Using the Scopus database, as on 21st of March 2021, 15,223 records focusing on "Covid-19 and Mental Health" were identified. The research on this theme averaged 8.90 citations per paper with 13.77% publications supported by funding agencies from global research agencies/firms were published. Researchers from 158 countries participated in mental health research on Covid-19, with top 12 countries accounting for 95.91% share of the global output and a major share of global citations in the subject. Although researchers from USA, U.K. and China led the global publication share (ranging from 10.40% to 26.56%), but researchers from China, France and Australia registered higher relative citation index (ranging from 1.19 to 2.31). Researchers from Harvard Medical School, USA, University of Toronto, Canada, and King's College, London, U.K. were the most productive (with 299, 270 and 222 papers). Researchers from the National University of Singapore (51.84 and 5.83), King's College, London, U.K. (27.23 and 3.06), Huazhong University of Science and Technology, China (23.65 and 2.66) were most impactful in terms of citation per paper and relative citation index. To conclude, this bibliometric analysis provides an overview of the extent of research activities in Covid-19 and mental health.
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Background: Animal studies are an indispensable part of fundamental and applied research essential for the advancement of human and veterinary health, including the current global quest for treatments and a vaccine development to combat the infectious diseases. This necessity is now clearly highlighted by the ongoing Covid-19 pandemic More recently a growing number of studies are published on this theme. Therefore, a bibliometric analysis of research on "Animal models in Covid-19" research is necessary and it is likely to focus on current status of research and indicate future direction in this study. Materials and Methods: The India's originated literature is searched on " Animal Models in Covid-19" using two set of keywords related to Covid-19 and animals in "Keyword" and "Title" (Title of articles) tags to reach the relevant publications. VOSviewer was applied to perform the bibliometric analysis of these articles. Bibliographical data obtained from above search strategy was analysed by using well-established bibliometric indices. Results: The bibliometric analysis of India's literature on the topic "Animal Models in Covid-19" research indicates that there were 2343 India's publications indexed in Scopus database during 2020-21. The topic witnessed the uneven participation of more than 160 countries, where 88.63% and more than 100.0% share of the global publications and citations share caming from top 10 countries. USA leads the ranking with global publication share of 28.16% share, followed by China (13.30%, U.K. (10.67%), Italy (9.93%). India's research output on this topic registered 7.46% share to global output. The 496 organizations and 869 authors participated in India's research on "Animal Model in Covid-19", of which the top 25 Indian organizations and 25 authors contributed 46.58% and 22.60% share to India's national publication output and 61.19% and 48.8% share to India's citation output respectively. AIIMS - New Delhi, PGIMER- Chandigarh, and IVRI-Bareilly were the most productive organizations (with 118, 115 and 68 publications). IVRI-Bareilly, PGIMER-Chandigarh and College of Veterinary Science, Mathura were the impactful organizations in terms of citation per paper and relative citation index. K. Dharma, R. Tiwari and Y.S. Malik were the most productive authors (with 63, 35 and 27 papers). H. Harapan, A.K.Singh and A Misra were the most impactful authors (with 90.42, 88.20 and 73.31 CPP).. International Journal of Research in Pharmaceutical Sciences, Indian Journal of Medical Research and Diabetes and Metabolic Syndromes. Clinical Research and Review were the most productive journals (with 72, 56 and 50 papers). Conclusion: The paper provides a understanding of the current research on animal models presently used in Covid-19 research in India, identify key players and their collaboration patterns and key sub-fields, which may be useful to practicing scholars and clinicians to advance their future research in a more effective manner and to policymakers in deciding the area of research to be funded in future.