AspirinDose-Response Relationship, DrugDrug Administration SchedulePlatelet Aggregation InhibitorsThromboxane B2Anti-Inflammatory Agents, Non-SteroidalIrelandStrokeMyocardial InfarctionTreatment OutcomeTiclopidineCyclooxygenase InhibitorsPlatelet AggregationSalicylatesPlatelet Function TestsDrug Therapy, CombinationBlood PlateletsSodium SalicylateFibrinolytic AgentsHemorrhageDouble-Blind MethodAnticoagulantsWarfarinAsthma, Aspirin-InducedTablets, Enteric-CoatedCyclooxygenase 1Bleeding TimeGastrointestinal HemorrhageProstaglandin-Endoperoxide SynthasesTime FactorsPlatelet ActivationIbuprofenThromboxanesThromboxane A2ThrombosisCyclooxygenase 2 InhibitorsDipyridamoleAcetaminophen