AspirinPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalTiclopidineThromboxane B2Cyclooxygenase InhibitorsPlatelet AggregationSalicylatesPlatelet Function TestsDose-Response Relationship, DrugDrug Therapy, CombinationDouble-Blind MethodBlood PlateletsSodium SalicylateTime FactorsFibrinolytic Agents