Epidemiology in the United States after World War II: the evolution of technique.
D002986:Clinical Trials as Topic; D003430:Cross-Sectional Studies; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000266:history*; D005069:Evaluation Studies as Topic; D006306:Health Surveys; D049673:History, 20th Century; D006801:Humans; D011159:Population Surveillance; D011897:Random Allocation; D012106:Research; D014481:United States