AIUM practice guideline for the performance of obstetric ultrasound examinations.
D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D009774:Obstetrics / Q000592:standards*; D011247:Pregnancy; D016216:Ultrasonography, Prenatal / Q000592:standards*; D014481:United States