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Varela-Roman A, Grigorian L, Barge E, Bassante P, de la Peña MG, Gonzalez-Juanatey JR.Varela-Roman A, et al.Heart. 2005 Apr;91(4):489-94. doi: 10.1136/hrt.2003.031922.Heart. 2005.PMID: 15772209Free PMC article.