title: Should flexible fiberoptic endoscopy replace barium contrast study of the upper gastrointestinal tract?
mesh_terms: D001466:Barium Sulfate; D003951:Diagnostic Errors; D004724:Endoscopy; D005188:False Negative Reactions; D005189:False Positive Reactions; D005336:Fiber Optic Technology; D005767:Gastrointestinal Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005773:Gastroscopy; D006801:Humans; D011859:Radiography
chemical_list: D001466:Barium Sulfate