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Mahan EF 3rd, Ballal RS, Nanda NC.Mahan EF 3rd, et al. Among authors: ballal rs.Am Heart J. 1991 Jul;122(1 Pt 1):238-41. doi: 10.1016/0002-8703(91)90787-i.Am Heart J. 1991.PMID: 2063747No abstract available.