Controlled trials of routine ultrasound in pregnancy.
D002986:Clinical Trials as Topic; D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D009664:Norway; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D011897:Random Allocation; D014463:Ultrasonography; D006113:United Kingdom