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Mercer-Rosa L, Parnell A, Forfia PR, Yang W, Goldmuntz E, Kawut SM.Mercer-Rosa L, et al.J Am Soc Echocardiogr. 2013 Nov;26(11):1322-9. doi: 10.1016/j.echo.2013.06.022. Epub 2013 Aug 6.J Am Soc Echocardiogr. 2013.PMID: 23928091Free PMC article.