Down's syndrome and parental coital rate.
D000328:Adult; D001315:Australia; D002648:Child; D002675:Child, Preschool; D003075:Coitus; D004314:Down Syndrome / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D010331:Paternal Age; D012068:Religion and Medicine; D013997:Time Factors