1. Department of Cardiac and Vascular Diseases, Jagiellonian University Collegium Medicum, John Paul II Hospital, Kraków, Poland
2. Institute of Cardiology, Jagiellonian University Medical College, Jagiellonian University, Krakow, Poland
3. Krakow Center for Medical Research and Technology, John Paul II Hospital, Krakow, Poland
4. New England Cardiac Arrhythmia Center, Tufts Medical Center Boston, Massachusetts, United States