1. Heart and Vascular Theme; Karolinska University Hospital and Karolinska Institutet; Stockholm Sweden
2. Department of Internal Medicine; University of Bergen; Bergen Norway
3. Department of Cardiology; Stavanger Norway
4. Clinical Electrophysiology Unit, Fondazione Cardiocentro Ticino; Lugano, Switzerland; and University Magdeburg; Germany
5. Heart Rhythm Department; Institute of Cardiology; Warsaw Poland
6. Clinic of Heart Diseases; Vilnius University; Lithuania
7. University Hospital; Basel Switzerland
8. Faculty of Health and Social Sciences; University of South Bohemia; Ceske Budejovice Czech Republic
9. Unidad de Arritmias; Hospital Universitari I Politècnic La Fe; Valencia Spain
10. University of Groningen, Department of Cardiology; University Medical Center Groningen; Groningen The Netherlands
11. University of Leeds; Leeds UK
12. Research Institute of Cardiology and Internal Diseases; Almaty Kazakhstan
13. Clinique Belvedere; Rabat Morocco