U.S. cesarean section rates 1990: an update.
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D000293:Adolescent; D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007902:Length of Stay; D008423:Maternal Age; D011247:Pregnancy; D014481:United States / Q000453:epidemiology