Melena and hematemesis; a follow-up investigation, with special reference to bleeding of unknown origin.
D005500:Follow-Up Studies; D006396:Hematemesis / Q000209:etiology*; D006470:Hemorrhage; D006801:Humans; D008551:Melena / Q000209:etiology*
HEMATEMESIS/etiology and pathogenesis; MELENA/etiology and pathogenesis