Timing in obstetrics.
D036861:Delivery, Obstetric; D004841:Episiotomy; D005113:Extraction, Obstetrical / Q000295:instrumentation; D005321:Extraembryonic Membranes; D005260:Female; D006801:Humans; D009321:Natural Childbirth; D010920:Placenta; D011247:Pregnancy; D011859:Radiography; D013997:Time Factors