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Boucher CA, Wackers FJ, Zaret BL, Mena IG.Boucher CA, et al. Among authors: wackers fj.Am J Cardiol. 1992 Jan 1;69(1):22-7. doi: 10.1016/0002-9149(92)90670-t.Am J Cardiol. 1992.PMID: 1530901Clinical Trial.