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Jick H, Porter J. Drug-induced gastrointestinal bleeding. Report from the Boston Collaborative Drug Surveillance Program, Boston University Medical Center. Lancet. 1978 Jul 8;2(8080):87–89.[PubMed]
Levy M. Aspirin use in patients with major upper gastrointestinal bleeding and peptic-ulcer disease. A report from the Boston Collaborative Drug Surveillance Program, Boston University Medical Center. N Engl J Med. 1974 May 23;290(21):1158–1162.[PubMed]
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