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Rao AK, Djamali A, Korcarz CE, Aeschlimann SE, Wolff MR, Stein JH.Rao AK, et al. Among authors: wolff mr.J Am Soc Echocardiogr. 2008 Jun;21(6):747-50. doi: 10.1016/j.echo.2007.10.026. Epub 2008 Jan 9.J Am Soc Echocardiogr. 2008.PMID: 18187299