1. Department of Cardiology, Third Faculty of Medicine, University Hospital Kralovske Vinohrady Charles University Prague Prague Czech Republic
2. Cardiocenter, Department of Cardiology Na Homolce Hospital Prague Czech Republic
3. Department of Data Analysis, Institute of Biostatistics and Analyses Masaryk University Brno Czech Republic
4. Cardiocenter Karlovy Vary Regional Hospital Karlovy Vary Czech Republic
5. Department of Electrophysiology, Helmsley Electrophysiology Center Icahn School of Medicine at Mount Sinai New York New York USA