DipyridamolePhosphodiesterase 3 InhibitorsTetrazolesPlatelet Aggregation InhibitorsDilazepVasodilator AgentsPhosphodiesterase InhibitorsAspirinAdenosineThioinosineThallium RadioisotopesTiclopidineCoronary CirculationCoronary DiseaseEquilibrative-Nucleoside Transporter 2Cyclic Nucleotide Phosphodiesterases, Type 3Equilibrative Nucleoside Transporter 1NucleosidesNitrogen RadioisotopesIntermittent ClaudicationExercise TestTechnetium Tc 99m SestamibiThalliumHeartTheophyllinePlatelet AggregationTomography, Emission-Computed, Single-PhotonNucleoside Transport ProteinsDrug Therapy, CombinationDobutamineTomography, Emission-ComputedSulfinpyrazoneMilrinoneCoronary AngiographyRubidium RadioisotopesEchocardiography, StressHyperemiaTime FactorsEchocardiographyLidoflazineEquilibrative Nucleoside Transport ProteinsCoronary Vessels2-ChloroadenosineInosineReceptors, Purinergic P2Y12Dose-Response Relationship, DrugPlatelet Function Tests