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Zaacks SM, Liebson PR, Calvin JE, Parrillo JE, Klein LW.Zaacks SM, et al. Among authors: liebson pr.J Am Coll Cardiol. 1999 Jan;33(1):107-18. doi: 10.1016/s0735-1097(98)00553-1.J Am Coll Cardiol. 1999.PMID: 9935016Free article.Review.