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Kessel-Schaefer A, Linka A, Pretre R, Buser P.Kessel-Schaefer A, et al. Among authors: buser p.Eur J Echocardiogr. 2006 Jun;7(3):239-42. doi: 10.1016/j.euje.2005.04.006.Eur J Echocardiogr. 2006.PMID: 15921962