[Statistical and etiological study of ulcerous hemorrhages].
D001699:Biometry; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006470:Hemorrhage; D006801:Humans; D010437:Peptic Ulcer / Q000150:complications*
HEMORRHAGE, GASTROINTESTINAL/etiology; PEPTIC ULCER/complications