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Marcus KA, Mavinkurve-Groothuis AM, Barends M, van Dijk A, Feuth T, de Korte C, Kapusta L.Marcus KA, et al.J Am Soc Echocardiogr. 2011 Jun;24(6):625-36. doi: 10.1016/j.echo.2011.01.021. Epub 2011 Mar 9.J Am Soc Echocardiogr. 2011.PMID: 21392941