[Hygienic characteristics of the regimen in Leningrad schools and extended-day groups].
D002648:Child; D002656:Child Day Care Centers; D006801:Humans; D009017:Morbidity; D012426:Russia; D012572:School Health Services; D012574:Schools
Gigienicheskaia kharakteristika rezhima v shkolakh i gruppakh prodlennogo dnia Leningrada.