1. Department of Electrocardiology, The John Paul II Hospital , 80 Prądnicka Street, 31-202, Krakow , Poland
2. Institute of Cardiology, Jagiellonian University Medical College , 12 Świętej Anny Street, 31-008, Krakow , Poland
3. Department of Cardiac and Vascular Diseases, The John Paul II Hospital , 80 Prądnicka Street, 31-202, Krakow , Poland
4. Department of Cardiac and Vascular Surgery, The John Paul II Hospital , 80 Prądnicka Street, 31-202, Krakow , Poland
5. Department of Cardiology, Norfolk and Norwich University Hospital, University of East Anglia , Norwich NR4 7TJ , UK
6. Department of Anesthesiology and Intensive Care, The John Paul II Hospital , Krakow , Poland