Gastroscopy of peptic ulceration.
D003937:Diagnosis, Differential; D005336:Fiber Optic Technology; D005756:Gastritis / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage; D020699:Gastroscopes; D005773:Gastroscopy; D006801:Humans; D008722:Methods; D010437:Peptic Ulcer / Q000175:diagnosis*; D011300:Preoperative Care; D013274:Stomach Neoplasms / Q000175:diagnosis