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Stein JH, Korcarz CE, Mays ME, Douglas PS, Palta M, Zhang H, Lecaire T, Paine D, Gustafson D, Fan L.Stein JH, et al.J Am Soc Echocardiogr. 2005 Mar;18(3):244-51. doi: 10.1016/j.echo.2004.12.002.J Am Soc Echocardiogr. 2005.PMID: 15746714