The evolution of maternal birthing position.
D036861:Delivery, Obstetric / Q000266:history* / Q000295:instrumentation; D005260:Female; D005602:France; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D007743:Labor, Obstetric; D011187:Posture; D011247:Pregnancy; D014481:United States