title: Should colonoscopy be the first investigation for colonic disease?
mesh_terms: D001466:Barium Sulfate; D003108:Colonic Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003113:Colonoscopy; D004733:Enema; D006801:Humans; D011859:Radiography
chemical_list: D001466:Barium Sulfate