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Gropler RJ, Geltman EM, Sampathkumaran K, Pérez JE, Schechtman KB, Conversano A, Sobel BE, Bergmann SR, Siegel BA.Gropler RJ, et al.J Am Coll Cardiol. 1993 Nov 15;22(6):1587-97. doi: 10.1016/0735-1097(93)90582-l.J Am Coll Cardiol. 1993.PMID: 8227825Free article.