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Kowalski M, Hoffman P, Rózański J, Rydlewska-Sadowska W.Kowalski M, et al. Among authors: hoffman p.J Am Soc Echocardiogr. 1998 Dec;11(12):1161-2. doi: 10.1016/s0894-7317(98)80014-x.J Am Soc Echocardiogr. 1998.PMID: 9923998
Kowalski M, Hoffman P, Siudalska H, Jakubowska E, Rydlewska-Sadowska W.Kowalski M, et al. Among authors: hoffman p.Acta Cardiol. 2001 Aug;56(4):233-7. doi: 10.2143/AC.56.4.2005649.Acta Cardiol. 2001.PMID: 11573828