DipyridamoleDilazepAdenosineVasodilator AgentsThioinosineThallium RadioisotopesCoronary CirculationEquilibrative-Nucleoside Transporter 2Equilibrative Nucleoside Transporter 1NucleosidesAspirinCoronary DiseaseNitrogen RadioisotopesExercise TestTechnetium Tc 99m SestamibiThalliumHeartTheophyllineTomography, Emission-Computed, Single-PhotonNucleoside Transport ProteinsDobutamineTomography, Emission-ComputedPlatelet Aggregation InhibitorsSulfinpyrazonePhosphodiesterase InhibitorsRubidium RadioisotopesEchocardiography, StressHyperemiaEchocardiographyLidoflazineEquilibrative Nucleoside Transport Proteins2-ChloroadenosineInosine