Population-based cohort studies.
Department of Epidemiology, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205, USA.
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Szklo
D016022:Case-Control Studies; D015331:Cohort Studies; D006262:Health; D006801:Humans; D009747:Nutritional Physiological Phenomena; D015203:Reproducibility of Results; D012107:Research Design; D014481:United States