AspirinDrug Administration ScheduleDose-Response Relationship, DrugPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalTiclopidineThromboxane B2Cyclooxygenase InhibitorsPlatelet AggregationSalicylatesDrug Therapy, CombinationPlatelet Function TestsDouble-Blind MethodBlood PlateletsTime FactorsSodium SalicylateTreatment OutcomeAdministration, OralAnticoagulantsHemorrhageWarfarinFibrinolytic AgentsAsthma, Aspirin-InducedTablets, Enteric-CoatedRadiation DosageLethal Dose 50Cyclooxygenase 1Bleeding TimeIbuprofenProstaglandin-Endoperoxide SynthasesGastrointestinal HemorrhagePlatelet ActivationThromboxanesDrug InteractionsThromboxane A2AcetaminophenThrombosisProspective StudiesCyclooxygenase 2 InhibitorsDrug ResistanceDipyridamoleRisk FactorsRadiometryLipoxinsGastric MucosaMyocardial InfarctionSulfinpyrazoneCyclooxygenase 2Stomach UlcerIndomethacinFollow-Up StudiesProstaglandinsStrokeNaproxenReye SyndromeInjections, IntravenousDrug HypersensitivityDinoprostoneDose-Response Relationship, RadiationDose Fractionation