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Gertz SD, Kragel AH, Kalan JM, Braunwald E, Roberts WC.Gertz SD, et al. Among authors: kragel ah.Am J Cardiol. 1990 Oct 15;66(12):904-9. doi: 10.1016/0002-9149(90)90923-o.Am J Cardiol. 1990.PMID: 2121015