Kligfield, Paul, Weill Cornell Medical College, Cornell Center of The New York Presbyterian Hospital, New York, USA Kligfield, Paul, Division of Cardiology, Department of Medicine, Weill Cornell Medical College, New York, USA Klimczak, Artur, Department of Cardiology, Medical University of ŁódŸ, Poland Klimczak, Artur Klimczak, Artur Klimczak-Tomaniak, Dominika Klimczak-Tomaniak, Dominika (The Netherlands) Klimeczek, Piotr Klimek, Katarzyna Klingel, Karin Klingenheben, Thomas, Praxis für Kardiologie, Bonn, Germany Klisiewicz, Anna, Klinika Wad Wrodzonych Serca Instytutu Kardiologii w Warszawie Aninie Klisiewicz, Anna Klisiewicz, Anna (Poland) Klocek, Konrad 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