title: The limitations of ultrasonic fetal cephalometry.
mesh_terms: D002508:Cephalometry / Q000295:instrumentation*; D005260:Female; D005333:Fetus; D006801:Humans; D008433:Mathematics; D011247:Pregnancy; D013995:Time; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography