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Alghamdi MH, Grosse-Wortmann L, Ahmad N, Mertens L, Friedberg MK.Alghamdi MH, et al.J Am Soc Echocardiogr. 2012 May;25(5):518-23. doi: 10.1016/j.echo.2012.01.023. Epub 2012 Feb 23.J Am Soc Echocardiogr. 2012.PMID: 22365707