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1.
China Journal of Chinese Materia Medica ; (24): 2181-2186, 2017.
Article in Chinese | WPRIM | ID: wpr-275151

ABSTRACT

To observe the clinical efficacy of modified Da Chaihu decoction in treating essential hypertension with anxiety, the randomized, controlled, clinical trial was performed in this study. One hundred and twenty-six hypertensive patients with anxiety meeting the inclusive criteria were randomized into the treatment group and the control group. All of the included patients in the above 2 groups were treated by amlodipine besylate tablets. Patients in the treatment group were given Chinese herbal medicine modified Da Chaihu decoction every day. And patients in the control group were given flupentixol and melitracen tablets. The treatment course was 4 weeks. Blood pressure, the score of traditional Chinese medicine syndrome, blood lipids, C reactive protein, the Hamilton anxiety scale score and adverse effects were observed. It has been identified that, both systolic and diastolic blood pressure were significantly reduced (P<0.05). However, no significant difference between the treatment group and the control group was identified. For traditional Chinese medicine syndrome, it was significantly improved in the treatment group (P<0.05). For blood lipids, TC, TG, HDL-C, and LDL-C were significantly improved in the treatment group (P<0.05). After treatment, only TC was significantly reduced in the treatment group when compared to the control group (P<0.05). For C reactive protein, it was significantly reduced in the treatment group after treatment (P<0.05). For anxiety, no significant difference between the treatment group and the control group on the Hamilton anxiety scale score was identified. For adverse effect, no severe adverse effect was identified in this study. The modified Da Chaihu decoction maybe effective in the treatment of essential hypertension with anxiety. In addition to a certain role in lowering blood pressure, the modified Da Chaihu decoction was also effective in improving traditional Chinese medicine syndrome and blood lipids, reducing the level of C reactive protein, relieving anxiety with little adverse effect.

2.
Chinese Journal of Endemiology ; (6): 359-361, 2013.
Article in Chinese | WPRIM | ID: wpr-642460

ABSTRACT

Objective To investigate the relationship between urinary iodine level and thyroid disease.Methods The study used a case-control design.One hundred and nine patients with thyroid disease from the Affiliated Hospital of Shanxi Institute for Endemic Disease Control were selected as case group from 2011 to 2012,and these patients were divided into three groups:Graves's disease (GD) group (n =48),chronic lymphocytic thyroiditis (HT) group(n =34) and thyroid nodules group(n =27).Sixty-two healthy people from the same region were selected as a control group.Urinary iodine was determined using arsenic cerium catalytic spectrophotometry,thyroid autoantibody (TRAb) and thyroid peroxidase antibody (TPOAb) was detected using electrochemiluminescence,while iodine absorption rate was measured using thyroid function analyzer,and thyroid volume was measured using type-B ultrasonic method.The relationship between urinary iodine level and patients with thyroid disease was compared with that of control group.Results Urinary iodine levels of patients with GD,HT,thyroid nodules and control groups were 313.95,375.20,220.20 and 196.50 μg/L,respectively.Urinary iodine levels of patients with GD and HT groups were higher than that of control group(Z =3.238,4.275,all P < 0.0125).Urinary iodine level of patients with HT was higher than that of thyroid nodules(Z =3.762,P < 0.0125).Iodine uptakes of GD,HT,thyroid nodules and control groups were (84.20 ± 16.90)%,(23.51 ± 6.72)%,(28.34 ± 8.02)% and (29.31 ± 8.41)%; TRAbs of patients with GD,HT,thyroid nodules and control groups were (58.57 ± 20.31)%,(2.54± 1.00)%,(2.98 ± 0.83)% and (3.01 ± 1.21)%; TPOAbs of patients with GD,HT,thyroid nodules and control groups were (117.03 ± 57.21)%,(251.00 ± 98.20)%,(16.81 ± 9.87)% and (15.00 ± 7.23)%.Iodine uptake,TRAb and TPOAb of GD group were higher than those of control group(P < 0.05).TPOAb of HT group was higher than that of control group(P < 0.05).Urinary iodine levels of GD group and HT group were positively correlated with TPOAb(correlation coefficient were 0.462,0.478 all P < 0.05).Conclusions Excessive iodine intake is found in patients with GD and HT.Determination of urinary iodine is helpful for individualized iodine supplementation.

3.
Chinese Journal of Endemiology ; (6): 196-200, 2013.
Article in Chinese | WPRIM | ID: wpr-642403

ABSTRACT

Objective To study the changes of iodine source and the nutritional status of iodine after termination of iodized salt supply in the areas with different water iodine concentrations in Shanxi province,in order to provide scientific bases for developing strategies on control and prevention of iodine deficiency disorders,and to study the cut-off value of water iodine level where iodized salt supply should be stopped.Methods In 2010 in Shanxi province,6 villages with 100% of non-iodized salt consumption rate were selected as the survey spots based on the iodine concentration in drinking water of 0-,50-,100-,150-,300-,≥500 μg/L.Villages'iodized salt supply was terminated thoroughly.In each village,20 children aged 8 to 10 were selected.At the same time,women of childbearing age 18 to 50 years old and adult men aged 18 to 60 were selected from the same families as the children.Diet surveys were conducted by the method of 3 days recall on all subjects.Drinking water samples,staple foods,supplementary foods and urinary samples of all subjects were collected and the iodine concentration was determined by arsenic-cerium catalytic spectrophotometry.Results ①In the villages of water iodine 25.9,70.6 μg/L,the medians urinary iodine of children,women and men were all ranged from 100 to 199 μg/L,which meant their iodine nutrition levels were appropriate.In the village of water iodine 109.0 μg/L,the medians urinary iodine of children,women and men were all ranged from 200 to 299 μg/L,which meant their iodine nutrition levels were more than appropriate.In the villages of water iodine 225.8,430.0,581.2 μg/L,the medians urinary iodine of children,women and men were all ≥ 300 μg/L,which meant their iodine nutrition levels were too high.②)In all the 6 villages,the intaking amount of iodine met and exceeded the standard recommended intake of dietary iodine by ICCIDD/UNICEF/WHO (8 to 10-year-old children ≥ 120 μg/d,women of childbearing age and adult men ≥ 150 μg/d).But in the village of water iodine 581.2 μg/L,the iodine intake was exceeded the daily maximum safe intake (children aged 8 to 10 ≤800 μg/d,women of childbearing age and adult man ≤ 1000 μg/d).③The amount of iodine ingestion from drinking water was increased with the water content of iodine.When water iodine exceeded 100 μg/L,the amount of iodine ingestion from drinking water was higher than from food intaking,and became a main resource of iodine in the human body.Conclusions In the counties of iodine concentration in drinking water above 100 μg/L in high iodine areas of Shanxi province,the water iodine becomes the most important source of iodine,and iodine nutritional level is more than appropriate or possible excess.It is recommended that in areas of high water iodine of Shanxi province,the standard cut-point of water iodine value is set to 100 μg/L.

4.
Chinese Journal of Endemiology ; (6): 305-307, 2012.
Article in Chinese | WPRIM | ID: wpr-642374

ABSTRACT

ObjectiveTo investigate the iodine nutritional status of residents in Shanxi province,and to provide a scientific basis for adjustment of control strategies and measures to iodine deficiency disorders (IDD).MethodsIn the 11 cities and 119 counties(cities,districts),except high water iodine townships,9 townships were selected in each county according to their sub-area positions of east,west,south,north and center,4 villages were sampled in each chosen township,and 8 households were selected in each chosen village in every chosen county (cities,districts ) with 9 or more townships.In every chosen county (cities,districts) with 6 to 9 townships,1 township was selected respectively in east,west,south,north and center sub-areas of the township,4 villages were sampled in each chosen township,and 15 households were selected in each chosen village.In the county (cities,districts) with 5 or less townships,all township were selected,4 villages were sampled in each chosen township,and 15 households were selected in each chosen village.Edible salt samples from these households were collected; iodized salt was determined by direct titration.In the 119 counties(cities,districts),1 township was selected,respectively,in east,west,south,north and center sub-areas in each county,and 20 children aged 8 - 10 in each of the selected townships were selected to collect urine samples and urinary iodine was determined by As-Ce catalytic spectrophotometry.Evaluation criteria:median urinary iodine < 100 μg/L was iodine deficiency,100 - 199 μg/L as appropriate,200 - 299 μg/L as more than appropriate,and ≥ 300 μg/L as iodine excess.ResultsMedian iodine of the 34 808 household salt samples was 31.55 mg/kg.The coverage rate of qualified iodized salt was 99.18%(34 521/34 808) and the consumption rate of qualified iodized salt was 97.12%(33 805/ 34 808).In the 11 cities,119 counties(cities,districts),the median of urinary iodine of 11 967 children aged 8 -10 was 244.0 μg/L,of which < 50 μg/L acoounted for 2.6%(312/11 967),50 - 99 μg/L accounted for 6.9%(823/11 967),100- 199 μg/L accounted for 26.3%(3145/11 967),200 - 299 μg/L accounted for 28.7%(3440/11 967),and 300 μg/L or higher accounted for 35.5%(4247/11 967).The medians of urinary iodine in the 9 municipal cities were 200 - 300 μg/L,and other 2 cities were 300 - 400 μg/L At the county level,the medians urinary iodine of children of the 119 counties(cities,districts) were 100 - 199 μg/L that accounted for 15.1%(18/119),200 - 299 μg/L accounted for 63.9%(76/119),and 300 μg/L or higher accounted for 21%(25/119).Conclusions The iodine nutrition level of residents in Shanxi province is more than appropriate.The salt iodine concentration in Shanxi province needs to be reduced,but the space is not wide.

5.
Chinese Journal of Endemiology ; (6): 56-59, 2011.
Article in Chinese | WPRIM | ID: wpr-642952

ABSTRACT

Objective To learn the present status of defluoridation water improvement project in Shanxi province in order to provide scientific basis for speeding up the prevention and control of endemic fluorosis.Methods According to "The National Technical Scheme for Endemic Disease Control" from 2005 to 2009, the investigation points were selected in the counties that implemented the measures of water improvement and defluoridation,the status of drinking water defluoridation Project was investigated, and the water fluoride levels were determined by fluoride selective ion electrode. Results The primary status was surveyed in 1658 water improvement and defluoridation projects in 51 counties. The resource of drinking water for water improvement and defluoridation projects was mostly ground water[accounting for 93.12% (1544/1658)]. Among 1658 water improvement and defluoridation projects 1405 projects worked well(accounting for 84.74%) and 190 projects intermittently worked (accounting for 11.46%). Sixty three projects abandoned (accounting for 3.80%), in Datong basin the abandoned projects accounted for 36.36% (12/33). Water fluoride content of 1595 water improvement and defluoridation projects had been determined, among them water fluoride content of 874 projects were above 1.0 mg/L (accounting for 54.80%). The situations of exceeded national standard in the five basins was different(H = 33.22,P < 0.01). The rate of over national standard of fluoride levels in drinking water was 88.37%(38/43) in Datong basin. Therefore, in Datong basin water improvement should be strengthened. Conclusions In Shanxi province the water improvement and defluoridation projects are basically running normally. However, the qualified rate is lower for the water improvement and defluoridation projects. The water improvement status varies dramatically among areas.The situation is still grim in Shanxi province. Water improvement and defluoridation needs to be strengthened to improve the effect of prevention and control of the disease.

6.
Chinese Journal of Endemiology ; (6): 16-19, 2011.
Article in Chinese | WPRIM | ID: wpr-642877

ABSTRACT

Objective To explore the long-term effect of endemic arsenism on oxidative stress and immune function, and to provide scientific basis for prevention and treatment of the disease in the areas. Methods In 2009, Using cluster sampling and typical investigation, the cross-sectional study was completed. The patient groups and the internal control group were selected in the arsenism areas after 5 years quality improvement of drinking water(Silizhuang village, Daying village and Gucheng village in Shanyin county, Gucheng city, Shanxi province) and they were divided into mild, moderate, severe case and internal control groups, respectively. The external control group was selected in a non-arsenism area(Yangzhuang village in Heshengbu city). The Oxidative stress indicators were determined and analyzed [serum superoxide dismutase (SOD) activity was determined with xanthine oxidase method, glutathione peroxidase(GSH-Px) activity was determined with 2-thio-2-nitrobenzoic acid method, and mmuuity malondisldohyde(MDA) levels was determined with thiobarbituric acid method]. The immune function was determined and analyzed [immunoglobulin G (IgG) was determined with radioimmunoassay method, and serum lysozyme was determined with turbidimetric method]. Results A total of 252 people were surveyed, in which the external control group, the internal control group, mild, moderate and severe patient groups were 56, 57, 49,44 and 46, respectively. Serum SOD activities were (72.19 ± 11.75), (66.96 ± 12.02), (49.79±11.07), (48.54 ±10.56) and (47.68 ± 10.68)kU/L, respectively. The difference of serum SOD activities between the groups was statistically significant(F = 52.42, P < 0.01 ). Serum SOD activities in the external control group were significantly higher than other groups (all P < 0.05). The value in the internal control group was significantly higher than the 3patient groups (all P < 0.05). There were no significant differences between the case groups (P > 0.05). Serum GSH-Px activities of the five groups were (197.41 ± 38.54), (195.02 ± 31.93), (187.26 ± 28.22), (187.24 ± 25.40),(186.88 ± 21.84)U/mg, respectively, and the difference between the groups was not significant(H = 4.21, P >0.05). Serum MDA levels of the five groups were (4.51 ± 2.14), (5.88 ± 2.00), (6.44 ± 2.83), (5.89 ± 2.57),(5.88 ± 2.40)μ mol/L, respectively, and the difference between the groups was statistically significant(F = 3.36,P < 0.05). The external control group was significantly lower than other groups(all P < 0.05). No significant difference was observed between other groups(all P > 0.05). Serum IgG levels were(11.16 ± 2.08), (8.15 ± 1.44), (8.77 ±2.54), (9.19 ± 1.97), (8.44 ± 2.52)g/L, respectively, and the difference between the groups was statistically significant(H = 52.92, P < 0.01 ). The external control group was significantly higher than other groups(all P <0.05). No significant difference was observed between other groups(all P > 0.05). Serum lysozyme levels were (13.57 ± 5.16), (10.05 ± 3.96), (8.78 ± 3.35), (8.72 ± 3.76), (9.38 ± 4.26)mg/L, respectively, and the difference between the groups was statistically significant (H = 35.00, P < 0.01 ). The external control group was significantly higher than other groups(all P < 0.05). No significant difference was observed between other groups(all P > 0.05). Conclusions The effect of arsenic on the body's oxidative stress response and immune function persists after 5 years of drinking low arsenic water. In addition to intensify arsenic removal from drinking water, it should also strengthen the monitoring of population's health in the diseased areas.

7.
Chinese Journal of Endemiology ; (6): 316-318, 2010.
Article in Chinese | WPRIM | ID: wpr-643441

ABSTRACT

Objective To explore into the condition of fluoride content of the drinking water and the present status of water-improving projects in the endemic fluomsis areas in Shanxi province,and to provide the evidence for making scientific and effective tactics in prevention and control.Methods In 2007,according to "The National Technical Scheme for Endemic Disease Control",screening for drinking water fluoride content was carried out in non-improving water villages of 15 counties(cities,districts).The investigation of all water-improving projects was carried out in 10 counties(cities).The fluoride content in drinking water was determined by fluoride selective ion electrode(GB/T 8538-1995).Results Screening for drinking water fluoride content was carried out in 969 non-improving water villages in 15 counties(cities,districts).Average water fluoride content was≤1.0 mg/L in 497 villages,accounting for 51.29%(497/969).Average water fluoride content was>1.0 mg/L in 472 villages.accounting for 48.71%(472/969).The overall standard drinking water fluoride content was mainlv>1.0-4.0mg/L,and the maximum average water fluoride content was 8.96 mg/L.The investigation of 290 water-improving projects was carried out in 10 counties(cities).Among 290 water-improving projects 213 water-improving projects were running normally,accounting for 73.45%(213/290);77 water-improving projects were running abnormally,accounting for 26.55%(77/290).Water fluoride content was≤1.0 mg/L in 158 projects,accounting for 54.48%(158/290).Water fluoride content was>1.0 mg/L in 132 projects,accounting for 45.52%(132/290).The maximal water fluoride content was 5.20 mg/L.Conclusions The situation of drinking water fluoride content over the national standard is serious in Shanxi province.The qualification rate was lower for the fluoride content of water-improving projects.Therefore,we should strength water-improving projects to raise the effectiveness of prevention and treatment and assure their quality.

8.
Chinese Journal of Endemiology ; (6): 525-527, 2010.
Article in Chinese | WPRIM | ID: wpr-642257

ABSTRACT

Objective To investigate the current situation and variation in the tendency of Kaschin-Beck disease (KBD) in Shanxi province, to assess the effectiveness of prevention measures, and to provide evidence for making scientific and effective tactics in prevention and control of the disease. Methods In 2008, according to "The National Technical Scheme for Kaschin-Beck Disease Control in 2007", children aged 7 - 12 years underwent clinical and X-ray examination in two historical severe KBD areas of Shanxi province, the observed position on Xray film was finger bone and carpal bone. Adults aged 16 years and above were clinically examined in 50 villages of 13 counties of KBD areas, Shanxi province. The diagnosis was based on "Diagnostic Standard of Kashin-Beck Disease"(GB 16003-1995), the adult patients were degreed according to the state of illness and divided into different groups according to their ages. Results A total of 181 children were examined, none of them was diagnosed as clinical KBD patient. The positive cases of X-ray were 2, X-ray detectable rate of metaphysis was 1.1% for children.In the 50 villages 13 871 of adults were examined and 801 KBD patients were found and the detectable rate was 5.77%. The detectable rate increased with age. The adult patients distributed mainly in the subpopulation aged 51years and above and these patients accounted for 70.66% (566/801) of total people examined. Degrees Ⅱ and Ⅲ patients at these ages accounted for 71.78%(206/287) of total degrees Ⅱ and Ⅲ patients. Conclusions The state of child KBD in Shanxi is under the national control standards. The detectable rate of adult KBD is higher. Relevant departments should pay close attention to the treatment of adult patients.

9.
Chinese Journal of Endemiology ; (6): 88-90, 2009.
Article in Chinese | WPRIM | ID: wpr-642239

ABSTRACT

Objective To investigate the relationship between arsenic in drinking water and skin lesions in endemic arsenism area in Shanyin County of Shanxi Province,in order to provide epidemiologic data for further arsenism research.Methods One hundred and eighty-nine endemic arsenism patients and 59 controls were randomly selected in 17 endemic amenism countries in Shanyin County of Shanxi Province.The content of arsenic in drinking water which wa8 collected indoom was half-quantitatively screened by a kit made by Chinese Center for Disease Control and Prevention,then quantitatively determined by HPLC-ICP-MS.Patients of endemic arsenism were diagnosed by "The Standard of Diagnosis for Endemic Amenism"(WS/T 211-2001).Results There were 64.9% (87/134)samples above the arsenic level(50μg/L)of drinking water and the median value of arsenic in drinking water was 91.43 μg/L in 134 water samples.The OR(95%CI)value between arsenic in drinking water and hyperkeratosis,hyperpigmentation,depigmentation was 2.46(1.22-4.94),3.34(1.50~7.44)and 2.86(1.50-5.46),respectively.The prevalence of hyperkeratosis,hyperpigmentation and depigmentation increased,as the arsenic in drinking water increased(≤10,≤50,≤200,>200μg/L),especially in>200μg/L group(OR=6.15,13.96,11.41,P<0.05).The arsenic level in drinking water of Ⅲ degree of depigmentation patients(318.300μg/L)was higher(P<0.05)than that of 0,Ⅰ and Ⅱ degree groups(86.670,131.800,1 10.590μg/L,P<0.05).Conclusions Shanyin County is a medial arsenic pollution area. Arsenic in drinking water is considered as a risk factor of skin lesion. The degree of skin lesions increased,as the arsenic in drinking water increased.

10.
Chinese Journal of Endemiology ; (6): 184-186, 2009.
Article in Chinese | WPRIM | ID: wpr-642235

ABSTRACT

Objective To become aware of the present distribution of drinking water source with high fluoride in endemic fluorosis disease areas in Shanxi Province, and to provide the evidence for making scientific and effective tactics in prevention and control. Methods According to "The National Technical Scheme for Endemic Disease Control" in the year 2004 to 2006, the investigation points were selected in 60 counties at 8 cities of Shanxi Province. The fluoride levels of water were determined by fluoride selective ion electrode. Results The fluoride content of water was determined in 2990 villages in 60 counties. Water fluorides content of 1658 villages were above 1.00 mg/L, accounted for 55.45%(1658/2990). The highest water fluoride content was 9.72 mg/L. Villages with high fluoride water in Taiyuan, Datong, Xinding, Linfen, Yuncheng basins accounted for 89.63% (1486/1658) among villages with high fluoride in Shanxi Province. In Shanxi Province the villages with high fluoride water were mainly distributed over 5 basins and scattered on the other areas. The distribution of drinking water source with high fluoride were different in 5 basins(H=316.10, P<0.05). The Water fluorides content in Datong basin(2.32 mg/L) was significantly higher than that of the other basins (P<0.05) and the ratio of drinking water fluoride levels under the national standard was 81.16%(336/414) in Datong basin. Conclusions Drinking water source with high fluoride are widespread distributed in Shanxi Province and mainly distributed in 5 basins. The situation of drinking water fluoride levels under the national standard is serious. The task of prevention and control for endemic fluorosis is still arduous. Therefore, we should strength water improving to raise the effect of prevention and treatment.

11.
Acta Academiae Medicinae Sinicae ; (6): 432-437, 2009.
Article in Chinese | WPRIM | ID: wpr-301677

ABSTRACT

<p><b>OBJECTIVE</b>To explore the influences of intervention on the abilities of detecting pulmonary tuberculosis cases in general hospitals.</p><p><b>METHODS</b>We selected 6 general hospitals at 3 different levels (A, B, and C). The intervened group included hospitals A1, B1, and C1, and the non-intervened group included hospitals A2, B2, and C2. The results after intervention were compared.</p><p><b>RESULTS</b>The report rate of pulmonary tuberculosis, sputum positive rate of reported cases, and sputum check rate of reported cases were significantly higher in hospital A1 than grouping hospital A2 (P = 0.000, P = 0.045, and P = 0.017, respectively). The report rate and sputum examination rate of reported cases were significantly higher in hospital B1 than grouping hospital B2 (P = 0.000, P = 0.024, respectively). The report rate and sputum examination rate of reported cases were significantly lower in hospital C1 than grouping hospital C2 (P = 0.000, P = 0.001, respectively). In hospital A1, the report rate, sputum positive rate of reported cases, and sputum check rate of reported cases were not significantly different before and after intervention (P = 0.182, P = 0.116, and P = 0.583, respectively). In hospital B1, the report rate were significantly different before and after intervention (P = 0.004), while the sputum positive rate of reported cases and sputum check rate of reported cases were not significantly different (P = 0.909, P = 0.052, respectively). In hospital C1, the report rate was significantly higher after intervention (P = 0.025). In hospital C2, the sputum check rate significantly increased (P = 0.000).</p><p><b>CONCLUSIONS</b>Intervention influences the hospitals abilities to detect pulmonary tuberculosis cases. However, more optimized and long-term intervention mechanism should be established to increase case detection rate of pulmonary tuberculosis.</p>


Subject(s)
Humans , Hospitals, General , Sputum , Microbiology , Tuberculosis, Pulmonary , Diagnosis
12.
Chinese Journal of Preventive Medicine ; (12): 93-95, 2008.
Article in Chinese | WPRIM | ID: wpr-270453

ABSTRACT

<p><b>OBJECTIVE</b>To explore the level and feature of neonate deformity in water arsenic exposure areas, as to finding out an evidence for the study and prevention of the arsenic exposure.</p><p><b>METHODS</b>The birth situation of neonate was surveyed from 1998 to 2004 in water arsenic exposure areas according to cross-sectional survey. The results were classified in accordance with ICD-10 and common surveillance of china. The population of Shanyin County served as the common people and the data were analyzed by SPSS 11.5 for windows.</p><p><b>RESULTS</b>The neonates surveyed were 2467 cases. There were 49 neonates deformity found in this investigation, giving a neonate deformity rate of 198.62 per 10,000 cases, which was shown significantly higher in water arsenic exposure areas than in the normal (U = 3.23, P < 0.01), with types of nervous system deformity, limbs deformity and congenital heart disease as in system classification. There was no significant difference of deformity rate in different sex neonates (chi2 = 0.32, P > 0.05).</p><p><b>CONCLUSION</b>The drinking high-arsenic water over a long period of time should be a risk factor of neonate deformity. Prevention and treatment of endemic arsenic exposure should be urgently needed.</p>


Subject(s)
Female , Humans , Infant, Newborn , Male , Arsenic , Arsenic Poisoning , Epidemiology , Congenital Abnormalities , Epidemiology , Cross-Sectional Studies , Environmental Exposure , Water , Water Pollutants, Chemical , Water Supply
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