title: Letter: Doppler ultrasound and fetal hazard.
mesh_terms: D001306:Auditory Pathways / Q000293:injuries; D004423:Ear / Q000196:embryology; D005260:Female; D005333:Fetus; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014465:Ultrasonics / Q000009:adverse effects*; D014463:Ultrasonography