AspirinPlatelet Aggregation InhibitorsThromboxane B2Platelet AggregationAnti-Inflammatory Agents, Non-SteroidalTiclopidineBlood PlateletsDrug Therapy, CombinationDouble-Blind MethodDose-Response Relationship, DrugCyclooxygenase InhibitorsSalicylatesPlatelet Function TestsSodium SalicylateFibrinolytic AgentsHemorrhageAsthma, Aspirin-InducedAnticoagulantsWarfarinTablets, Enteric-CoatedCyclooxygenase 1Bleeding TimeGastrointestinal HemorrhageProstaglandin-Endoperoxide SynthasesPlatelet ActivationThromboxanesIbuprofenThromboxane A2