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2. Bleeding peptic ulcer;Laine;N Engl J Med,1994
3. Concurrent use of nonsteroidal anti-inflammatory drugs and oral anticoagulants places elderly persons at high risk for hemorrhaggc peptic ulcer disease;Shorr;Arch Intern Med,1993
4. The role of infectious agents in peptic ulcer disease;Tytgat;Gastroenterol Int,1993
5. Differing prevalence of Helicobacter in bleeding and nonbleeding ulcers;Hosktng;Gastroenterology,1992