Obstetric ultrasound: uses and limitations.
D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis; D005333:Fetus / Q000502:physiology; D005865:Gestational Age; D006128:Growth; D006801:Humans; D010922:Placenta Diseases / Q000175:diagnosis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D014463:Ultrasonography