Cesarean section: changing indications, 1968--1977.
D001724:Birth Weight; D002585:Cesarean Section / Q000266:history / Q000639:trends*; D005113:Extraction, Obstetrical; D005260:Female; D005323:Fetal Monitoring; D006801:Humans; D007231:Infant, Newborn; D007744:Obstetric Labor Complications / Q000601:surgery; D010298:Parity; D011247:Pregnancy; D011300:Preoperative Care