Ng, F H High incidence of clopidogrel-associated gastrointestinal bleeding in patients with previous peptic ulcer disease. [electronic resource] - Alimentary pharmacology & therapeutics Aug 2003 - 443-9 p. digital Publication Type: Evaluation Study; Journal Article ISSN: 0269-2813 Standard No.: 10.1046/j.1365-2036.2003.01693.x doi Subjects--Topical Terms: AgedAspirin--adverse effectsClopidogrelCohort StudiesFemaleFollow-Up StudiesGastrointestinal Hemorrhage--chemically inducedHumansLongitudinal StudiesMalePeptic Ulcer--complicationsPlatelet Aggregation Inhibitors--adverse effectsRecurrenceRetrospective StudiesRisk FactorsTiclopidine--adverse effects