1. Heart Lung CentreLeiden University Medical Centre Leiden Netherlands
2. Clinica Montevergine, Mercogliano (AV), and Clinica San Michele Maddaloni (CE) Italy
3. Arrhythmia Section, Cardiology Department, Hospital ClínicUniversitat de Barcelona Barcelona Spain
4. Institut d'Investigació August Pi i Sunyer (IDIBAPS) Barcelona Spain
5. Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV) Madrid Spain
6. Department of ElectrophysiologyHeart Center Leipzig at the University of Leipzig Leipzig Germany
7. Institute for Clinical and Experimental Medicine (IKEM) Praha Czech Republic
8. E. Meshalkin National medical research center of the Ministry of Health of the Russian Federation Novosibirsk Russia
9. ANMCO Research Centre Florence Italy
10. EURObservational Research ProgrammeEuropean Society of Cardiology Sophia‐Antipolis Cedex France
11. Division of Cardiology, “Città della Salute e della Scienza di Torino” Hospital, Department of Medical SciencesUniversity of Turin Italy
12. Davidai Arrhythmia Center, Leviev Heart Center, Sheba Medical Center Ramat Gan, Tel Hashomer, and Sackler School of MedicineTel Aviv University Tel Aviv Israel
13. Acibadem City Clinic Tokuda Hospital Sofia
14. Department of CardiologyDepartment of Medical ScienceUppsala University Uppsala Sweden