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Valeur N, Fritz-Hansen T, Risum N, Mogelvang R, Bloch Thomsen PE, Søgaard P.Valeur N, et al. Among authors: sogaard p.J Am Soc Echocardiogr. 2010 Jun;23(6):621-7. doi: 10.1016/j.echo.2010.04.006.J Am Soc Echocardiogr. 2010.PMID: 20497861