title: The double contrast barium meal--a simplification.
mesh_terms: D001466:Barium Sulfate; D001639:Bicarbonates; D002245:Carbon Dioxide; D002951:Citrates; D003287:Contrast Media; D004381:Duodenal Ulcer / Q000000981:diagnostic imaging; D004386:Duodenum / Q000000981:diagnostic imaging*; D006801:Humans; D008722:Methods; D011859:Radiography; D013270:Stomach / Q000000981:diagnostic imaging*; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging; D013276:Stomach Ulcer / Q000000981:diagnostic imaging
chemical_list: D001639:Bicarbonates; D002951:Citrates; D003287:Contrast Media; D002245:Carbon Dioxide; D001466:Barium Sulfate