[Increase in the frequency and risk of birth of children with Down syndrome in Leningrad (1982-1989)].
Mant
D I
DI
D004314:Down Syndrome / Q000453:epidemiology*; D006801:Humans; D007231:Infant, Newborn; D012307:Risk Factors; D012426:Russia / Q000453:epidemiology
Uvelichenie chastoty i riska rozhdeniia deteĭ s bolezn'iu Dauna v Leningrade (1982-1989).