Jędrzejczyk-Patej, Ewa, Department of Cardiology, Congenital Hear t Disease and Electrotherapy, Medical University of Silesia, Silesian Center for Heart Diseases, Zabrze, Poland Jędrzejczyk-Patej, Ewa, Department of Cardiology, Congenital Hear t Disease and Electr otherapy, Silesian Medical Univer sity, Silesian Centre for Hear t Diseases, Zabrze, Poland Jędrzejczyk-Patej, Ewa, Department of Cardiology, Congenital Heart Diseases and Electr otherapy, Silesian Medical University, Silesian Center for Heart Diseases Zabrze Jędrzejczyk-Spaho, Joanna Jedrzejek, Marek Jędrzejewski, Jarosław Jedynak, Zbigniew Jedynak, Zbigniew, Klinika Zaburzeń Rytmu Serca Instytutu Kardiologii w Warszawie Jeevanantham, Vinodh, Wake Forest University Medicine Winston, Salem, USA Jeevanantham, Vinodh Jeevanantham, Vinodh, Wake Forest University, Winston-Salem, NC, USA Jegier, Aleksandra Marciniak i Anna Jegier, Bogdan, Department of Cardiac Surgery, 1st Chair of Cardiology and Cardiac Surgery, Medical University of Łódź, Poland Jegier, Bogdan Jegier, Katarzyna Szmigielska i Anna, Zakład Medycyny Sportowej Uniwersytetu Medycznego w Łodzi Jelic, Sania Jelonek, Michał, Center for Cardiovascular Research and Development of American Heart of Poland, Katowice, Poland Jelonek, Olga Jelonek, Olga Jemielity, Marek Jemielity, Marek, Poznań University of Medical Sciences Cardiac Surgery and Transplantology Department (Poland) Jemielity, Marek Jendrej, Janusz Jenei, Csaba, Institute of Cardiology, University of Debrecen, Debrecen, Hungary Jenei, Csaba