[Postoperative hemorrhage].
D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D005743:Gastrectomy / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013276:Stomach Ulcer / Q000601:surgery