1. First Department of Cardiology, Interventional Electrocardiology and Hypertension, Jagiellonian University Medical College, Kopernika 17, 31-501 Kraków, Poland
2. Cardiocenter, Department of Cardiology, Third Faculty of Medicine, Charles University, Praque, Czech Republic
3. Department of Statistics, Cracow University of Economics, Kraków, Poland
4. Department of Cardiology, H. Klimontowicz Specialistic Hospital, Gorlice, Poland
5. Heart Rhythm Service, Kingston Health Sciences Center, Kingston, Ontario, Canada