title: The double contrast barium meal in relation to the diagnosis of early mucosal lesions in the stomach and duodenum.
mesh_terms: D001464:Barium; D003287:Contrast Media; D004379:Duodenal Neoplasms / Q000000981:diagnostic imaging*; D005753:Gastric Mucosa / Q000000981:diagnostic imaging; D006801:Humans; D007413:Intestinal Mucosa / Q000000981:diagnostic imaging; D008722:Methods; D011859:Radiography; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*
chemical_list: D003287:Contrast Media; D001464:Barium