[History of epidemiologic methods-- cohort studies].
Qin
Ying
Y
Department of Epidemiology and Health Statistics, School of Public Health, Beijing University, Beijing 100083, China
Zhan
Si-Ting
ST
Li
Li-ming
LM
D002681:China; D015331:Cohort Studies; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans