Placental localization and diagnosis of antenatal hemorrhage by ultrasonography.
D000649:Amniocentesis; D002585:Cesarean Section; D005260:Female; D006801:Humans; D006828:Hydatidiform Mole / Q000175:diagnosis; D008722:Methods; D010920:Placenta; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D013997:Time Factors; D014463:Ultrasonography; D014592:Uterine Hemorrhage / Q000175:diagnosis* / Q000209:etiology / Q000517:prevention & control; D014621:Vagina