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Ashley EA, Kardos A, Jack ES, Habenbacher W, Wheeler M, Kim YM, Froning J, Myers J, Whyte G, Froelicher V, Douglas P.Ashley EA, et al.J Am Coll Cardiol. 2006 Aug 1;48(3):523-31. doi: 10.1016/j.jacc.2006.02.071. Epub 2006 Jul 12.J Am Coll Cardiol. 2006.PMID: 16875979Free article.