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Cigarroa JE, Hillis LD.Cigarroa JE, et al. Among authors: hillis ld.Cardiol Clin. 2006 May;24(2):255-63, vii. doi: 10.1016/j.ccl.2006.01.002.Cardiol Clin. 2006.PMID: 16781942Review.