Kądziela, Jacek, Institute of Cardiology, Warsaw, Poland Kafi, Mohammad Kaftan, Havane Asuman, Pamukkale University School of Medicine, Department of Cardiology Kaftan, Havane Asuman, Pamukkale University Medical Faculty Department of Cardiology Kahlert, Philipp Kahr, Peter C. Kahraman, Erkan, Tekirdag State Hospital Kahveci, Gokhan, Kartal Kosuyolu Heart Education and Research Hospital, Istanbul Kahya Eren, Nihan, Atatürk Education and Research Hospital, Department of Cardiology, İzmir Kahya Eren, Nihan, Ataturk Training and Research Hospital, Department of Cardiology, Izmir, Turkey Kai, Zhang Kaiser, Elisabeth, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil Kakar, Puneet Kaklamanis, Loukas Kala, Petr Kalarus, Hubert Krupa i Zbigniew Kalarus, Janusz Prokopczuk i Zbigniew Kalarus, Lech Poloński i Zbigniew Kalarus, Zbigniew Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Silesian Medical University, Silesian Center of Heart Diseases (Poland) Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Disease and Electrotherapy, Medical University of Silesia, Silesian Center for Heart Diseases, Zabrze, Poland Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Disease and Electrotherapy, Silesian Medical University, Silesian Centre for Heart Diseases, Zabrze, Kalarus, Zbigniew Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Diseases and Electr otherapy, Silesian Medical University, Silesian Center for Heart Diseases Zabrze Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Disease and Electrotherapy, Silesian Medical University, Silesian Centre for Heart Disease, Zabrze (Poland)