Making waves: current controversies in obstetric ultrasound.
D000757:Anencephaly / Q000175:diagnosis; D000013:Congenital Abnormalities / Q000175:diagnosis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011272:Pregnancy, Multiple; D014463:Ultrasonography