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Chaudhry SI, Wang Y, Gill TM, Krumholz HM.Chaudhry SI, et al.J Am Coll Cardiol. 2010 Jan 26;55(4):309-16. doi: 10.1016/j.jacc.2009.07.066.J Am Coll Cardiol. 2010.PMID: 20117435Free PMC article.