Fibreoptic endoscopy of the upper gastrointestinal tract and its application in the Royal Navy.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004064:Digestive System / Q000473:pathology; D004415:Dyspepsia / Q000175:diagnosis* / Q000473:pathology; D004724:Endoscopy; D005260:Female; D005336:Fiber Optic Technology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009326:Naval Medicine; D006113:United Kingdom