On the use of x-rays and ultrasound in locating the placenta.
D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005865:Gestational Age; D006801:Humans; D008722:Methods; D010920:Placenta / Q000000981:diagnostic imaging*; D010922:Placenta Diseases / Q000175:diagnosis*; D010923:Placenta Previa / Q000175:diagnosis / Q000000981:diagnostic imaging; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis; D011829:Radiation Dosage; D011859:Radiography; D014463:Ultrasonography