Rates of Down's syndrome in live births and at midtrimester amniocentesis.
D000649:Amniocentesis; D004314:Down Syndrome / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D009518:New York; D009656:North America; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D013548:Sweden