[Methodological aspects of a selective study of the composition of hospitalized patients].
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006760:Hospitalization; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D014798:Vital Statistics
Metodicheskie voprosy vyborochnogo izucheniia sostava gospitalizirovannykh bol'nymk.