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Langberg JJ, Calkins H, el-Atassi R, Borganelli M, Leon A, Kalbfleisch SJ, Morady F.Langberg JJ, et al. Among authors: leon a.Circulation. 1992 Nov;86(5):1469-74. doi: 10.1161/01.cir.86.5.1469.Circulation. 1992.PMID: 1423961
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