Knauer-Janicka, Grażyna Knight, Peter Knop, Mateusz, Department of Congenital Hear t Diseases and Pediatric Cardiology, Silesian University of Medicine, Silesian Centre for Hear t Diseases, Zabrze, Poland Knopman, David S. Knuf, Markus, University of Mainz, Children’s Hospital, Mainz, Germany Knuf, Markus Ko, Young-Guk Ko, Young-Guk (Korea, Republic Of) Kobayashi, Adam Kobayashi, Daiki, St. Luke's International Hospital Kobayashi, Hiroaki Kobayashi, Ryota Kobayashi, Yuta Kobus, Grażyna Kobusiak-Prokopowicz, Małgorzata, Department of Cardiology, Medical University of Wrocław, Poland Kobusiak-Prokopowicz, Małgorzata Kobusiak-Prokopowicz, Małgorzata, Chair and Department of Cardiology, Wroclaw Medical University, Borowska 213, 50-556 Wroclaw, Poland (Poland) Kobusiak-Prokopowicz, Przemysław Nowicki i Małgorzata Kobuszewska-Chwirot, Mariola Kobuszewska-Chwirot, Mariola, II Klinika Chorób Serca Instytutu Kardiologii Akademii Medycznej w Gdańsku Kobza, Richard Kobza, Richard Koc, Fatih Koć, Marcin Koç, Mevlüt, Department of Cardiology, Adana Numune Education and Research Hospital, Adana, Turkey