title: Barium plastic filters in roentgen diagnosis of placenta previa.
mesh_terms: D001464:Barium; D005260:Female; D005374:Filtration; D006801:Humans; D010920:Placenta; D010923:Placenta Previa; D010969:Plastics; D011247:Pregnancy; D014965:X-Rays / Q000295:instrumentation
chemical_list: D010969:Plastics; D001464:Barium
keywords: PLACENTA/praevia; ROENTGEN RAYS/apparatus