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Nishimura RA, Holmes DR Jr, Michela MA.Nishimura RA, et al.J Am Coll Cardiol. 1991 Mar 1;17(3):828-33. doi: 10.1016/s0735-1097(10)80204-9.J Am Coll Cardiol. 1991.PMID: 1993803Free article.