Controlled trials of routine ultrasound in pregnancy.
D002986:Clinical Trials as Topic; D000013:Congenital Abnormalities / Q000175:diagnosis*; D005260:Female; D005323:Fetal Monitoring; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D009774:Obstetrics; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D014463:Ultrasonography