Kloch, Małgorzata Kloch-Badełek, Małgorzata Kloppe, Axel, Department of Cardiology and Angiology, Klinikum Bergmannsheil, Ruhr University Bochum, Germany Klotz, Bogdan Klug, Gert Knaapen, Paul Knabbe, Cornelius Knapp, Małgorzata, Clinical Department of Cardiology, Medical University, Białystok, Poland Knapp, Małgorzata, Division of Cardiology, Medical University of Białystok, Poland Knapp, Małgorzata 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