1. Cardiology Division, Stavanger University Hospital, Stavanger, Norway
2. Institute of Internal Medicine, University of Bergen, Bergen, Norway
3. Heart and Vascular Theme, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden
4. Department of Medical Science and Cardiology, Uppsala University, Uppsala, Sweden
5. Clinical Electrophysiology Unit, Fondazione Cardiocentro Ticino, Lugano, Switzerland
6. Department of Cardiology, Klinikum Bielefeld, Germany
7. Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds
8. Department of Cardiology, Ziekenhuis Oost-Limburg, Genk, Belgium
9. Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Diepenbeek, Belgium
10. University Hospital Basel, University of Basel, Switzerland
11. Clinic of Heart Diseases, Vilnius University, Lithuania
12. Arrhythmia Department, Helsicore - Israeli-Georgian Medical Research Clinic, Tbilisi, Georgia
13. Cardiostimulation and Electrophysiology sector at “St. Ekaterina” University Multi-profile Hospital for Active Treatment, Sofia, Bulgaria