AspirinIbuprofenAnti-Inflammatory Agents, Non-SteroidalSensitivity and SpecificityCyclooxygenase InhibitorsCyclooxygenase 2 InhibitorsNaproxenDiclofenacAnalgesics, Non-NarcoticAcetaminophenPlatelet Aggregation InhibitorsProstaglandin-Endoperoxide SynthasesKetoprofenIndomethacinCyclooxygenase 1Thromboxane B2Cyclooxygenase 2SulfonesLactonesGastrointestinal DiseasesSalicylatesSulfonamidesPyrazolesDose-Response Relationship, DrugGastrointestinal HemorrhageStomach UlcerDrug Therapy, CombinationDouble-Blind MethodSulindacTime FactorsAntipyreticsDrug InteractionsTiclopidineDinoprostonePlatelet AggregationPiroxicamSodium SalicylateDuctus Arteriosus, PatentNitrobenzenesRisk FactorsProstaglandinsEtodolacTreatment OutcomeThiazinesProspective StudiesPain