title: [Design of cohort studies and statistics analysis].
authors.forename: Y X
authors.initials: YX
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004812:Epidemiologic Methods; D006801:Humans; D008875:Middle Aged; D012307:Risk Factors; D013223:Statistics as Topic