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Langer A, Krucoff MW, Klootwijk P, Simoons ML, Granger CB, Barr A, Califf RM, Armstrong PW.Langer A, et al. Among authors: armstrong pw.J Am Coll Cardiol. 1998 Mar 15;31(4):783-9. doi: 10.1016/s0735-1097(97)00544-5.J Am Coll Cardiol. 1998.PMID: 9525547Free article.