title: Fentanyl in endoscopy of upper gastrointestinal tract.
mesh_terms: D004724:Endoscopy; D005283:Fentanyl / Q000008:administration & dosage* / Q000009:adverse effects; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D006801:Humans
chemical_list: D005283:Fentanyl