Low dose obstetric radiography.
D005260:Female; D005333:Fetus / Q000528:radiation effects; D006801:Humans; D010387:Pelvimetry; D011187:Posture; D011247:Pregnancy; D011296:Prenatal Diagnosis; D011829:Radiation Dosage; D011859:Radiography / Q000379:methods*; D012867:Skin / Q000528:radiation effects