The value of upper gastro-intestinal fibrescopy.
D003951:Diagnostic Errors; D004381:Duodenal Ulcer / Q000175:diagnosis / Q000000981:diagnostic imaging; D004415:Dyspepsia / Q000175:diagnosis; D004935:Esophageal Diseases / Q000175:diagnosis; D020701:Esophagoscopes; D004945:Esophagoscopy; D005336:Fiber Optic Technology; D020699:Gastroscopes; D005773:Gastroscopy; D006801:Humans; D011859:Radiography; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging; D013276:Stomach Ulcer / Q000175:diagnosis / Q000000981:diagnostic imaging