Kowalski, Oskar Kowalski, Oskar, Department of Cardiology, Congenital Heart Diseases and Electrotherapy Kowalski, Oskar, I Klinika Kardiologii, Wrodzonych Wad Serca i Elektroterapii SUM, Śląskie Centrum Chorób Serca w ‎Zabrzu Kowalski, Oskar, Department of Cardiology, Congenital Heart Disease and Electrotherapy, Silesian Medical University, Silesian Centre for Heart Diseases (Poland) Kowalski, Oskar, Silesian Center for Heart Diseases in Zabrze Kowalski, Oskar Kowalski, Oskar Kowalski, Oskar Kowalski, Robert Kowara, Michał, 1st Department of Cardiology, Medical University of Warsaw, Warsaw, Poland Department of Experimental and Clinical Physiology, Medical University of Warsaw, Warsaw, Poland Kowara, Michał Kowara, Michał Kownator, Serge Kowrach, Marek, Department of Internal Diseases, Diabetology, and Endocrinology, Medical University of Warsaw, Warsaw, Poland Koza, Yavuzer, Department of Cardiology, Ataturk University Faculty of Medicine, Erzurum, Turkey Kozak, Józef Kozak, Mariusz Kozak, Mariusz Kozak-Szkopek, Elżbieta Kozakiewicz, Krystyna, 3rd Department of Cardiology, Upper Silesian Centre of Cardiology, Medical University of Silesia, Katowice, Poland Kozakiewicz, Krystyna, Third Department of Cardiology, Medical University of Silesia, Katowice Kozakiewicz, Krystyna, 3rd Department of Cardiology, Medical University of Silesia, Katowice, Poland Kozakiewicz, Krystyna, Medical University of Silesia, Katowice (Poland) Kozakiewicz, Krystyna Kozakiewicz, Krystyna