[GASTROSCOPY].
D005756:Gastritis; D006471:Gastrointestinal Hemorrhage; D005773:Gastroscopy; D006470:Hemorrhage; D006801:Humans; D013274:Stomach Neoplasms; D013276:Stomach Ulcer
GASTRITIS; GASTROSCOPY; HEMORRHAGE, GASTROINTESTINAL; REVIEW; STOMACH NEOPLASMS; STOMACH ULCER