title: A new prototype 2-channel upper gastrointestinal operating fiberscope.
mesh_terms: D005336:Fiber Optic Technology; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D020699:Gastroscopes; D005773:Gastroscopy / Q000379:methods; D006801:Humans; D013272:Stomach Diseases / Q000175:diagnosis