title: Roentgenographic visualization of the placenta in the third stage of labor; a preliminary report.
mesh_terms: D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D010920:Placenta / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011859:Radiography; D013672:Technology; D014937:Work
keywords: PLACENTA/roentgenography