Related by context. Frequent words. (Click for all words.) 62 retrospective cohort study 58 prospective cohort 57 Cohort Study 55 Longitudinal Study 55 Atherosclerosis Risk 54 longitudinal study 54 NHANES III 52 prospective observational 51 AIDS Clinical Trials 51 Nationwide Inpatient Sample 51 NHANES 51 sociodemographic 51 multicenter study 51 epidemiologic studies 50 prevalences 50 epidemiologic 50 Interview Survey 50 Immunization Survey 49 epidemiological 49 socio demographic 49 Patient Registry 49 Indians Alaska Natives 49 dietary intakes 49 Statens Serum Institut 49 Medical Expenditure Panel 49 liver transplant recipients 48 genetic polymorphisms 48 study 48 longitudinal studies 48 Epidemiological 48 Gynecologic Oncology Group 48 BRFSS 48 multivariate analyzes 48 Behavioral Risk 47 Observational studies 47 perinatal mortality 47 serum vitamin D 47 epidemiological studies 47 substudy 47 thrombophilia 47 End Results SEER 47 Epidemiologic 47 Cancer Registry 47 genotyped 47 atherothrombosis 47 colorectal adenomas 47 cerebrovascular diseases 47 multicentre 46 Natural S equol 46 National Longitudinal Study 46 potential confounders 46 covariate 46 Surveillance Epidemiology 46 placebo controlled studies 46 genotypic 46 covariates 46 univariate 46 placebo controlled clinical 46 Preterm Birth 46 serum samples 46 nonalcoholic fatty liver 46 Prospective Investigation 46 human microbiome 46 Alzheimer Disease Neuroimaging Initiative 46 Nutrition Examination Survey NHANES 46 theUniversity 46 body fatness 46 demographic characteristics 46 gene expression profiles 46 journal Epidemiology 45 highest quintile 45 National Comorbidity Survey 45 Pediatric Academic Societies 45 Phenotype 45 placebo controlled clinical trials 45 observational study 45 neuropsychiatric symptoms 45 Longitudinal 45 folate intake 45 haplotypes 45 SWOG 45 phylogenetic analysis 45 studies 45 blind randomized controlled 45 National Longitudinal Survey 45 disease NAFLD 45 cohort 44 poor metabolizers 44 methylation patterns 44 placebo controlled trials 44 HRQOL 44 Epidemiological studies 44 occupational exposures 44 Expenditure Survey 44 Cardiovascular Disease 44 affective disorders 44 observational studies 44 Mental disorders 44 Human papillomavirus 44 fluvastatin 44 born preterm