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1 Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Silesian Centre for Heart Diseases, Silesian University of Medicine, Zabrze, Poland. mszulik3@wp.pl.
1 Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Silesian Centre for Heart Diseases, Silesian University of Medicine, Zabrze, Poland. mszulik3@wp.pl.