EARLY FIBERSCOPE ENDOSCOPY FOR UPPER GASTROINTESTINAL BLEEDING.
D004724:Endoscopy; D004864:Equipment and Supplies; D006471:Gastrointestinal Hemorrhage; D005773:Gastroscopy; D006470:Hemorrhage; D006801:Humans
EQUIPMENT AND SUPPLIES; GASTROSCOPY; HEMORRHAGE, GASTROINTESTINAL