Diagnostic approach to upper gastro-intestinal bleeding using early fiberscopy.
D004724:Endoscopy; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000209:etiology; D005773:Gastroscopy; D005898:Glass; D006801:Humans; D008722:Methods