Kalarus, Zbigniew, Silesian Center for Heart Diseases, Department of Cardiology, Congenital Heart Diseases and Electrotherapy. Medical University of Silesia Kalarus, Zbigniew, Department of Cardiology, Congenital Heart Diseases and Electrotherapy, Silesian Center for Heart Diseases, Medical University of Silesia, Zabrze, Poland Kalarus, Zbigniew Kalay, Nihat, Department of Cardiology, Sorgun State Hospital, Yozgat, Turkey Kalay, Nihat Kalaycıoğlu, Ezgi, Ahi Evren Chest Cardiovascular Surgery Education and Research Hospital Kaleta, Anna M. Kaleta, Anna Maria Kaleta, Anna M. Kaleta, Michał Kalin, Katarzyna, Institute of Cardiology, Arrhythmia Department, Warsaw, Poland Kalińczuk, Łukasz Kalińczuk, Łukasz Kalińczuk, Łukasz (Poland) Kalinowski, Leszek Kalinowski, Mariusz Kaliszczak, Robert Kalkan, Ali Kemal, Mehmet Akif Ersoy Thorasic and Cardiovascular Surgery Training and Research Hospital Kalkan, Ali Kemal, Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital (Türkiye) Kalkan, Ali Kemal, Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Education and Training Hospital, Department of Cardiology, Istanbul Kalkan, Ali Kemal, Department of Cardiology, Mehmet Akif Ersoy Thoracic and Cardiovascular Surgery Training and Research Hospital, Istanbul, Turkey Kalkan, Mehmet Emin Kalkan, Mehmet Emin, Kartal Kosuyolu Training and Research Hospital, Department of Cardiology, Istanbul (Türkiye) Kalnk-Szafran, Monika Kalpak, Oliver