[Study of digestive organ diseases].
D000367:Age Factors; D002648:Child; D004812:Epidemiologic Methods; D005260:Female; D005767:Gastrointestinal Diseases / Q000453:epidemiology*; D006801:Humans; D008297:Male; D012306:Risk; D012737:Sex Factors; D012959:Socioeconomic Factors; D014586:USSR
K voprosu ob izuchenii bolezneĭ organov pishchevareniia.