The use of ultrasound scanning in obstetrics.
D005260:Female; D005317:Fetal Growth Retardation / Q000175:diagnosis; D005865:Gestational Age; D006801:Humans; D007434:Intrauterine Devices; D010922:Placenta Diseases / Q000175:diagnosis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D011261:Pregnancy Trimester, First; D014465:Ultrasonics / Q000295:instrumentation; D014463:Ultrasonography