title: Endoscopic study of X-rays negative dyspepsia.
mesh_terms: D000328:Adult; D000368:Aged; D004415:Dyspepsia / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D004724:Endoscopy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography