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1.
J Am Heart Assoc ; 12(23): e030575, 2023 Dec 05.
Article in English | MEDLINE | ID: mdl-38038172

ABSTRACT

BACKGROUND: The modified Blalock-Taussig-Thomas shunt is the gold standard palliation for securing pulmonary blood flow in infants with ductal-dependent pulmonary blood flow. Recently, the ductus arteriosus stent (DAS) has become a viable alternative. METHODS AND RESULTS: This was a retrospective multicenter study of neonates ≤30 days undergoing DAS or Blalock-Taussig-Thomas shunt placement between January 1, 2017 and December 31, 2020 at hospitals reporting to the Pediatric Health Information Systems database. We performed generalized linear mixed-effects modeling to evaluate trends in intervention and intercenter variation, propensity score adjustment and inverse probability weighting with linear mixed-effects modeling to analyze length of stay and cost of hospitalization, and generalized linear mixed modeling to analyze differences in 30-day outcomes. There were 1874 subjects (58% male, 61% White) from 45 centers (29% DAS). Odds of DAS increased with time (odds ratio [OR] 1.23, annually, P<0.01 [95% CI, 1.10-1.38]) with significant intercenter variation (median OR, 3.81 [95% CI, 2.74-5.91]). DAS was associated with shorter hospital length of stay (ratio of geometric means, 0.76 [95% CI, 0.63-0.91]), shorter intensive care unit length of stay (ratio of geometric means, 0.77 [95% CI, 0.61-0.97]), and less expensive hospitalization (ratio of geometric means, 0.70 [95% CI, 0.56-0.87]). Intervention was not significantly associated with odds of 30-day transplant-free survival (OR,1.18 [95% CI, 0.70-1.99]) or freedom from catheter reintervention (OR, 1.02 [95% CI, 0.65-1.58]), but DAS was associated with 30-day freedom from composite adverse outcome (OR, 1.51 [95% CI, 1.11-2.05]). CONCLUSIONS: Use of DAS is increasing, but there is variability across centers. Though odds of transplant-free survival and reintervention were not significantly different after DAS, and DAS was associated with shorter length of stay and lower in-hospital costs.


Subject(s)
Blalock-Taussig Procedure , Ductus Arteriosus, Patent , Ductus Arteriosus , Health Information Systems , Female , Humans , Infant , Infant, Newborn , Male , Blalock-Taussig Procedure/adverse effects , Ductus Arteriosus, Patent/surgery , Ductus Arteriosus, Patent/etiology , Length of Stay , Palliative Care/methods , Pulmonary Artery , Pulmonary Circulation , Retrospective Studies , Stents , Treatment Outcome
3.
Acad Pediatr ; 23(1): 165-171, 2023.
Article in English | MEDLINE | ID: mdl-35584765

ABSTRACT

OBJECTIVE: This study compares current suicidal ideation, prior suicide attempt and associated self-reported risk factors in adolescents with and without access to firearms. METHODS: Using data from a clinically applied behavioral health assessment completed by adolescents presenting to a tertiary children's hospital emergency department (ED; N = 15,806), we evaluated the association between firearm access (ie, firearm in the home or ability to obtain one within 24 hours), each of the included suicide risk factors (ie, depressive symptoms, trauma victimization, bullying victimization), and our primary outcomes (ie, current suicidal ideation and prior suicide attempt). We performed regression analyses on 3 groups: 1) The overall population; 2) Only the participants with firearm access; and 3) Only the participants without firearm access. RESULTS: Fourteen percent (2179/15,806) of the sample reported a firearm in the home or ability to access one within 24 hours. Overall, 6.8% of participants reported current suicidal ideation and 9.1% reported prior suicide attempt. Youth with firearm access had 1.52 times higher odds of current suicidal ideation and 1.61 times higher odds of prior suicide attempt compared to youth without firearm access. All included suicide risk factors were found to significantly increase the odds of current suicidal ideation and prior suicide attempt in the overall sample; this increase was similar in the groups with and without firearm access. CONCLUSIONS: Adolescents with firearm access have higher odds of suicidal ideation and prior attempt compared to those without firearm access, highlighting the need for universal ED-based screening for suicidality and lethal means.


Subject(s)
Firearms , Child , Humans , Adolescent , Suicide, Attempted , Suicidal Ideation , Violence , Emergency Service, Hospital
4.
Liver Transpl ; 28(8): 1288-1298, 2022 08.
Article in English | MEDLINE | ID: mdl-35188336

ABSTRACT

Acute-on-chronic liver failure (ACLF) is an acute decompensation of chronic liver disease leading to multiorgan failure and mortality. The objective of this study was to evaluate characteristics and outcomes of children with ACLF who are at the highest priority for liver transplantation (LT) on the United Network for Organ Sharing (UNOS) database-listed as status 1B. The characteristics and outcomes of 478 children with ACLF listed as status 1B on the UNOS LT waiting list from 2007-2019 were compared with children with similar or higher priority listing for transplant: 929 with acute liver failure (ALF) listed as status 1A and 808 with metabolic diseases and malignancies listed as status 1B (termed "non-ACLF"). Children with ACLF had comparable rates of cumulative organ failures compared with ALF (45% vs. 44%; p > 0.99) listings, but higher than non-ACLF (45% vs. 1%; p < 0.001). ACLF had the lowest LT rate (79%, 84%, 95%; p < 0.001), highest pre-LT mortality (20%, 11%, 1%; p < 0.001), and longest waitlist time (57, 3, 56 days; p < 0.001), and none recovered without LT (0%, 4%, 1%; p < 0.001). In survival analyses, ACLF was associated with an increased adjusted hazard ratio (HR) for post-LT mortality (HR, 1.50 vs. ALF [95% confidence interval, CI, 1.02-2.19; p = 0.04] and HR, 1.64 vs. non-ACLF [95% CI, 1.15-2.34; p = 0.01]). ACLF has the least favorable waitlist and post-LT outcomes of all patients who are status 1A/1B. Increased prioritization on the LT waiting list may offer children with ACLF an opportunity for enhanced outcomes.


Subject(s)
Acute-On-Chronic Liver Failure , Liver Transplantation , Acute-On-Chronic Liver Failure/diagnosis , Acute-On-Chronic Liver Failure/etiology , Acute-On-Chronic Liver Failure/surgery , Child , Databases, Factual , Humans , Liver Transplantation/adverse effects , Multiple Organ Failure , Retrospective Studies , Waiting Lists
5.
Resuscitation ; 168: 52-57, 2021 11.
Article in English | MEDLINE | ID: mdl-34536558

ABSTRACT

AIMS: To determine the prevalence of pulmonary hypertension (PH) among children with in-hospital cardiac arrest (IHCA) and its association with survival. METHODS: Children (<18 years) admitted to ICUs participating in the Virtual Pediatric Systems multicenter registry between January 2011 and December 2017 who had an IHCA during their hospitalization were included. Patients were classified by whether they had a documented diagnosis of PH at the time of IHCA. Clinical characteristics were compared between patients with and without PH. After propensity score matching, conditional logistic regression within the matched cohort determined the association between PH and survival to hospital discharge. RESULTS: Of 18,575 children with IHCA during the study period, 1,590 (8.6%) had a pre-arrest diagnosis of PH. Patients with PH were more likely to be 29 days to 2 years of age, female, Black/African American, and American Indian/Alaskan Native, and to be treated in a cardiac ICU or mixed PICU/cardiac ICU. At ICU admission, PH patients had a lower probability of death as determined by the Pediatric Index of Mortality 2 (PIM-2) score. Patients with PH were more likely to be receiving inhaled nitric oxide (13.0% vs. 2.1%; p < 0.001). Propensity score matching successfully matched 1,302 PH patients with 3,604 non-PH patients. Patients with PH were less likely to survive to hospital discharge (aOR 0.83; 95% CI: 0.72-0.95; p = 0.01) than non-PH patients. CONCLUSIONS: In this large multicenter study, 8.6% of children with IHCA had pre-existing documented PH. These children were less likely to survive to hospital discharge than those without PH.


Subject(s)
Cardiopulmonary Resuscitation , Heart Arrest , Hypertension, Pulmonary , Child , Female , Heart Arrest/epidemiology , Heart Arrest/therapy , Hospitals , Humans , Hypertension, Pulmonary/epidemiology , Patient Discharge
6.
Pediatrics ; 147(5)2021 05.
Article in English | MEDLINE | ID: mdl-33833072

ABSTRACT

OBJECTIVES: To determine if maternal intrapartum group B Streptococcus (GBS) antibiotic prophylaxis is associated with increased risk of childhood asthma, eczema, food allergy, or allergic rhinitis. METHODS: Retrospective cohort study of 14 046 children. GBS prophylaxis was defined as administration of intravenous penicillin, ampicillin, cefazolin, clindamycin, or vancomycin to the mother, ≥4 hours before delivery. Composite primary outcome was asthma, eczema, or food allergy diagnosis within 5 years of age, identified by diagnosis codes and appropriate medication prescription. Allergic rhinitis was defined by using diagnostic codes only and analyzed as a separate outcome. Analysis was a priori stratified by delivery mode and conducted by using Cox proportional hazards model adjusted for multiple confounders and covariates. Secondary analyses, restricted to children retained in cohort at 5 years' age, were conducted by using multivariate logistic regression. RESULTS: GBS prophylaxis was not associated with increased incidence of composite outcome among infants delivered vaginally (hazard ratio: 1.13, 95% confidence interval [CI]: 0.95-1.33) or by cesarean delivery (hazard ratio: 1.08, 95% CI: 0.88-1.32). At 5 years of age, among 10 404 children retained in the study, GBS prophylaxis was not associated with the composite outcome in vaginal (odds ratio: 1.21, 95% CI: 0.96-1.52) or cesarean delivery (odds ratio: 1.17, 95% CI: 0.88-1.56) cohorts. Outcomes of asthma, eczema, food allergy, separately, and allergic rhinitis were also not associated with GBS prophylaxis. CONCLUSIONS: Intrapartum GBS prophylaxis was not associated with subsequent diagnosis of asthma, eczema, food allergy, or allergic rhinitis in the first 5 years of age.


Subject(s)
Anti-Bacterial Agents/adverse effects , Antibiotic Prophylaxis/adverse effects , Asthma/chemically induced , Eczema/chemically induced , Food Hypersensitivity/etiology , Hypersensitivity/etiology , Parturition , Streptococcal Infections/prevention & control , Streptococcus agalactiae , Child, Preschool , Cohort Studies , Female , Humans , Infant , Infant, Newborn , Male , Pregnancy , Retrospective Studies
7.
J Am Heart Assoc ; 10(4): e018286, 2021 02 16.
Article in English | MEDLINE | ID: mdl-33554612

ABSTRACT

Background Children with congenital heart disease (CHD) are known to consume a disproportionate share of resources, yet there are limited data concerning trends in resource use and mortality among admitted children with CHD. We hypothesize that charges in CHD-related admissions increased but that mortality improved over time. Methods and Results This study, including patients <18 years old with CHD, examined inpatient admissions from the nationally representative Kids' Inpatient Database from 2003 to 2016 in order to assess the frequency, medical complexity, and outcomes of CHD hospital admissions. A total of 859 843 admissions of children with CHD were identified. CHD admissions increased by 31.8% from 2003 to 2016, whereas overall pediatric admissions decreased by 13.4%. Compared with non-CHD admissions, those with CHD were more likely to be <1 year of age (80.5% versus 63.3%), and to have ≥1 complex chronic condition (39.7% versus 9.3%). For CHD admissions, mortality was higher (2.97% versus 0.31%) and adjusted median charges greater ($48 426 [interquartile range (IQR), $11.932-$161 048] versus $4697 [IQR, $2551-$12 301]) (P<0.0001 for all). Among CHD admissions, whereas adjusted median charges increased from $35 577 (IQR, $9303-$110 439) to $61 696 (IQR, $15 212-$219 237), mortality decreased from 3.2% to 2.7% (P for trend <0.0001). CHD admissions accounted for an increased proportion of all inpatient deaths, from 18.0% in 2003 to 24.5% in 2016. Conclusions Children admitted with CHD are 10 times more likely to die than those without CHD and have higher charges. Although the rate of mortality in CHD admissions decreased, children with CHD accounted for an increasing proportion of all pediatric inpatient deaths. Effective resource allocation is critical to optimize outcomes in these high-risk patients.


Subject(s)
Forecasting , Health Resources/trends , Heart Defects, Congenital/therapy , Inpatients , Patient Admission/trends , Adolescent , Child , Child, Preschool , Databases, Factual , Female , Follow-Up Studies , Heart Defects, Congenital/mortality , Humans , Infant , Male , Retrospective Studies , Survival Rate/trends , United States/epidemiology
8.
Pediatr Cardiol ; 41(5): 899-904, 2020 Jun.
Article in English | MEDLINE | ID: mdl-32107587

ABSTRACT

This study evaluates the effectiveness of mandatory pulse oximetry screening. The objective is to evaluate whether mandatory pulse oximetry testing had decreased the late critical congenital heart disease (CCHD) diagnosis rate and reduced mortality in neonatal subjects. This was a single center, retrospective cohort study comparing the timing of diagnosis of CCHD between neonates undergoing cardiac surgery in 2009-2010, prior to mandatory pulse oximetry screening, and neonates in 2015-2016, after mandatory pulse oximetry screening was instituted. Follow-up was for 1 year. We defined CCHD as lesions requiring surgical correction within 30 days of life. Exclusions included: pacemaker insertions, vascular ring divisions, closure of patent ductus arteriosus, arterial cutdown, or extracorporeal membrane oxygenation cannulation without structural heart disease as the sole procedure, or if subjects were born at home. Infants diagnosed prior to discharge from birth hospital were defined as early postnatal; late postnatal subjects were diagnosed after birth hospital discharge. In-hospital mortality and 1-year mortality were measured. A total of 527 neonates were included; 251 (47.6%) comprised the pre-mandatory pulse oximetry screening cohort (2009-2010). Only 3.6% of the 2009-2010 cohort and 4.3% of the 2015-2016 cohort were diagnosed late (p = 0.66). One-year mortality decreased during the study period (17.2% in 2009-2010 vs 10.5% in 2015-2016, p = 0.03). There were no deaths in the late CCHD diagnosis groups. Mandatory pulse oximetry screening legislation has not changed the late postnatal diagnosis rate at our institution. Mortality for neonatal CCHD has declined, but this decline is not attributable to mandatory pulse oximetry screening.


Subject(s)
Heart Defects, Congenital/diagnosis , Heart Defects, Congenital/mortality , Neonatal Screening/methods , Oximetry/methods , Cohort Studies , Delayed Diagnosis , Heart Defects, Congenital/surgery , Hospital Mortality , Humans , Infant , Infant, Newborn , Mass Screening/methods , Retrospective Studies
9.
J Asthma ; 57(12): 1372-1378, 2020 12.
Article in English | MEDLINE | ID: mdl-31389724

ABSTRACT

Objective: While reminder-based electronic monitoring systems have shown promise in enhancing inhaled corticosteroid (ICS) adherence in select populations, more engaging strategies may be needed in families of children with high-risk asthma. This study assesses the acceptability and feasibility of gain-framed ICS adherence incentives in families of urban, minority children with frequent asthma hospitalization.Methods: We enrolled children aged 5-11 years with multiple yearly asthma hospitalizations in a 2-month, mixed methods, ICS adherence incentive pilot study. All participants received inhaler sensors and a smartphone app to track ICS use. During month 1, families received daily adherence reminders and weekly feedback, and children earned up to $1/day for complete adherence. No reminders, feedback, or incentives were provided in month 2. We assessed feasibility and acceptability using caregiver surveys and semi-structured interviews and ICS adherence using electronic monitoring data.Results: Of the 29 families approached, 20 enrolled (69%). Participants were primarily Black (95%), publicly insured (75%), and averaged 2.9 asthma hospitalizations in the prior year. Fifteen of the 16 caregivers (94%) surveyed at month 2 liked the idea of receiving adherence incentives. Mean adherence was significantly higher in month 1 compared with month 2 (80% vs. 33%, mean difference = 47%; 95% CI [33, 61], p < 0.001). Caregivers reported that their competing priorities often limited adherence, while incentives helped motivate child adherence.Conclusions: ICS adherence incentives were acceptable and feasible in a high-risk cohort of children with asthma. Future studies should assess the efficacy of adherence incentives in enhancing ICS adherence in high-risk children.


Subject(s)
Asthma/drug therapy , Financing, Personal/statistics & numerical data , Glucocorticoids/administration & dosage , Medication Adherence/psychology , Reward , Administration, Inhalation , Asthma/psychology , Caregivers/psychology , Caregivers/statistics & numerical data , Child , Child, Preschool , Feasibility Studies , Female , Humans , Male , Medication Adherence/statistics & numerical data , Minority Groups/psychology , Minority Groups/statistics & numerical data , Motivation , Pilot Projects , Prospective Studies , Reminder Systems , Surveys and Questionnaires/statistics & numerical data
10.
J Cancer ; 10(1): 168-177, 2019.
Article in English | MEDLINE | ID: mdl-30662537

ABSTRACT

Background: Radiation therapy plays an increasingly important role in the treatment of patients with non-small-cell lung cancer (NSCLC). The purpose of the present study is to assess the survival outcomes of radiotherapy treatment compared to other treatment modalities and to determine the potential role of advanced technologies in radiotherapy on improving survival. Methods: We used cancer incidence and survival data from the Surveillance, Epidemiology, and End Results database linked to U.S. Census data to compare survival outcomes of 288,670 patients with stage I-IV NSCLC treated between 1999 and 2008. The primary endpoint was overall survival. Results: Among the 288,670 patients diagnosed with stage I-IV NSCLC, 92,374 (32%) patients received radiotherapy-almost double the number receiving surgery (51,961, 18%). Compared to other treatment groups and across all stages of NSCLC, patients treated with radiotherapy showed greater median and overall survival than patients without radiation treatment (p < 0.0001). Radiotherapy had effectively improved overall survival regardless of age, gender, and histological categorization. Radiotherapy treatment received during the recent time period 2004 - 2008 is correlated with enhanced survival compared to the earlier time period 1999 - 2003. Conclusion: Radiation therapy was correlated with increased overall survival for all patients with primary NSCLC across stages. Combined surgery and radiotherapy treatment also correlates with improved survival, signaling the value of bimodal or multimodal treatments. Population-based increases in overall survival were seen in the recent time period, suggesting the potential role of advanced radiotherapeutic technologies in enhancing survival outcomes for lung cancer patients.

11.
J Asthma ; 56(1): 95-103, 2019 01.
Article in English | MEDLINE | ID: mdl-29437489

ABSTRACT

OBJECTIVE: To assess the feasibility of a mobile health, inhaled corticosteroid (ICS) adherence reminder intervention and to characterize adherence trajectories immediately following severe asthma exacerbation in high-risk urban children with persistent asthma. METHODS: Children aged 2-13 with persistent asthma were enrolled in this pilot randomized controlled trial during an asthma emergency department (ED) visit or hospitalization. Intervention arm participants received daily text message reminders for 30 days, and both arms received electronic sensors to measure ICS use. Primary outcomes were feasibility of sensor use and text message acceptability. Secondary outcomes included adherence to prescribed ICS regimen and 30-day adherence trajectories. Group-based trajectory modeling was used to examine adherence trajectories. RESULTS: Forty-one participants (mean age 5.9) were randomized to intervention (n = 21) or control (n = 20). Overall, 85% were Black, 88% had public insurance, and 51% of the caregivers had a high school education or less. Thirty-two participant families (78%) transmitted medication adherence data; of caregivers who completed the acceptability survey, 25 (96%) chose to receive daily reminders beyond that study interval. Secondary outcome analyses demonstrated similar average daily adherence between groups (intervention = 36%; control = 32%, P = 0.73). Three adherence trajectories were identified with none ever exceeding 80% adherence. CONCLUSIONS: Within a high-risk pediatric cohort, electronic monitoring of ICS use and adherence reminders delivered via text message were feasible for most participants, but there was no signal of effect. Adherence trajectories following severe exacerbation were suboptimal, demonstrating an important opportunity for asthma care improvement.


Subject(s)
Adrenal Cortex Hormones/therapeutic use , Asthma/drug therapy , Bronchodilator Agents/therapeutic use , Medication Adherence/statistics & numerical data , Reminder Systems , Remote Sensing Technology/methods , Text Messaging , Administration, Inhalation , Adrenal Cortex Hormones/administration & dosage , Bronchodilator Agents/administration & dosage , Child , Child, Preschool , Emergency Service, Hospital , Female , Hospitalization , Humans , Male , Patient Compliance , Patient Preference , Pilot Projects , Severity of Illness Index , Socioeconomic Factors
12.
Cancer ; 122(12): 1921-7, 2016 06 15.
Article in English | MEDLINE | ID: mdl-27062154

ABSTRACT

BACKGROUND: Brain metastases (BM) remain an important cause of morbidity and mortality in patients with lung cancer. The current study evaluated population-based incidence and outcomes of BM in patients with nonmetastatic lung cancer. METHODS: Patients diagnosed with nonmetastatic first primary lung cancer between 1973 and 2011 in the Metropolitan Detroit Surveillance, Epidemiology, and End Results (SEER) registry were used for the current analysis. Age-adjusted odds ratios of developing BM based on various demographic characteristics and histology were calculated with 95% confidence intervals. Adjusted Cox proportional hazard ratios and log-rank tests of Kaplan-Meier survival curves were calculated to evaluate survival differences for non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). RESULTS: The incidence of BM in patients with nonmetastatic NSCLC and SCLC was 9% and 18%, respectively. There was variation in the incidence of BM according to NCSLC histology. The incidence of BM was higher in patients aged <60 years for both NSCLC and SCLC, but there were no differences noted by race for either histological group. Female patients with NSCLC were more likely to have BM than male patients. There was variation in the proportion of BM in both patients with NSCLC and SCLC over the three 13-year periods of diagnosis. The risk of death (hazard ratio) was found to be significantly higher for patients with NSCLC with BM, but was not significantly higher in patients with SCLC with BM. CONCLUSIONS: The incidence of BM in patients with nonmetastatic lung cancer varies according to histology, age, and sex. BM are associated with worse survival for patients with NSCLC but not those with SCLC. Cancer 2016;122:1921-7. © 2016 American Cancer Society.


Subject(s)
Brain Neoplasms/epidemiology , Brain Neoplasms/secondary , Lung Neoplasms/epidemiology , Lung Neoplasms/pathology , Adult , Aged , Aged, 80 and over , Cities/epidemiology , Female , Humans , Incidence , Male , Michigan/epidemiology , Middle Aged , SEER Program , Young Adult
13.
J Registry Manag ; 39(4): 158-66, 2012.
Article in English | MEDLINE | ID: mdl-23493021

ABSTRACT

PURPOSE: Census tract variables have not been widely available for SEER-wide data due to several technical reasons; thus, prior studies have been conducted on a specific-community basis only or used county-level data. This study is the first to evaluate long-term chronological trends in cancer survival by selected socioeconomic variables of census tract level based on multiple SEER registry data. METHODS: 177,128 breast cancer and 45,615 non-Hodgkin's lymphoma (NHL) cases diagnosed from 1973-2007 and followed through 2009 from 4 SEER registries (Detroit, Hawaii, Utah and Seattle-Puget Sound), were linked to decennial census tract data (1970-2000). Five-year relative survival was calculated using the lifetable method according to census tract poverty levels and by year of diagnosis. The Cox proportional hazard model was used to estimate hazard ratios (HR) for death in 5 years from diagnosis, adjusted for selected covariates and SEER historical stage in the limited models only. RESULTS: Although the 5-year relative survival from both cancers improved similarly across poverty levels as percent per year, absolute increase per year was greater for lower poverty neighborhoods. This trend was most consistently observed for distant stage of cancer. The multivariable HR were significantly higher in the highest poverty group (greater than 20%), 1.41 and 1.33, for breast cancer and NHL respectively, than the lowest (greater than or equal to 5%). Additional adjustment for stage at diagnosis reduced the HR in the highest poverty level in breast cancer patients to 1.30, but had minimal effect on NHL. Socioeconomic disparities in overall survival were more evident in neighborhoods with higher proportions of racial minorities and in middle-aged patients than younger or older patients. CONCLUSIONS: Relative survival for both types of cancer improved over last 35-year period across poverty levels, but absolute differences increased. More studies are needed to develop innovative community-level interventions.


Subject(s)
Breast Neoplasms/mortality , Health Status Disparities , Lymphoma, Non-Hodgkin/mortality , Neoplasms/mortality , Poverty/statistics & numerical data , Adult , Aged , Aged, 80 and over , Breast Neoplasms/epidemiology , Breast Neoplasms/therapy , Female , Humans , Lymphoma, Non-Hodgkin/epidemiology , Lymphoma, Non-Hodgkin/therapy , Male , Middle Aged , Neoplasms/epidemiology , Population Surveillance , Proportional Hazards Models , SEER Program/statistics & numerical data , Socioeconomic Factors , Survival Analysis , United States/epidemiology
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