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28. Peix A, Batista E, Cabrera LO, Rodríguez L, Padrón K, Saínz B, et al. Gated-SPECT myocardial perfusion imaging and coronary calcium score for evaluation of patients with acute chest pain and a normal or nondiagnostic electrocardiogram. Coron Artery Dis. 2012;23(7):438-44.