The role of sonography in identifying neural tube defects.
D000649:Amniocentesis; D004200:Diseases in Twins; D005260:Female; D005313:Fetal Death / Q000175:diagnosis; D005865:Gestational Age; D006801:Humans; D009436:Neural Tube Defects / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography