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Schmidt U, Han RO, DiSalvo TG, Guerrero JL, Gold HK, Zapol WM, Bloch KD, Semigran MJ.Schmidt U, et al. Among authors: zapol wm.J Am Coll Cardiol. 2001 Jun 1;37(7):1981-8. doi: 10.1016/s0735-1097(01)01270-0.J Am Coll Cardiol. 2001.PMID: 11401142Free article.