Upper gastrointestinal bleeding with special reference to peptic ulcer.
D000367:Age Factors; D001803:Blood Transfusion; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010438:Peptic Ulcer Hemorrhage / Q000401:mortality / Q000601:surgery; D011183:Postoperative Complications; D011379:Prognosis; D012737:Sex Factors; D013997:Time Factors