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Willens HJ, Chirinos JA, Gomez-Marin O, Fertel DP, Ghany RA, Alfonso CE, Hare JM.Willens HJ, et al.J Am Soc Echocardiogr. 2008 Jun;21(6):715-9. doi: 10.1016/j.echo.2007.10.003. Epub 2008 Mar 6.J Am Soc Echocardiogr. 2008.PMID: 18325734