1. Luigi Sacco University Hospital, Milan (M.S., A.G., G.B.F.).
2. Department of Systems Medicine, University of Rome Tor Vergata, Italy (M.S.).
3. Department of Cardiology, Johns Hopkins University, Baltimore, MD (A.G., N.B.).
4. APHP, Hôpital Pitié Salpêtrière, Paris, France (M.L.).
5. Cardiology, University Hospital Zurich, Switzerland (A.B.).
6. Department of Elctrophysiology, Herzzentrum Lubeck, Germany (J.V., R.T.).
7. Cardiology Unit, “Card. G. Panico” Hospital, Tricase, Italy (P.P.).
8. Arrhythmology & Electrophysiology Unit, San Raffaele Hospital, IRCCS, Milan (S.G.).
9. Cardiology Unit, Ospedale San Filippo Neri (C.P.).
10. Cardiology Unit, Policlinico Umberto I, Rome (C.L.).
11. U.O.S.V.D. Cardiac Electrophysiology – “V. Fazzi” Hospital, Lecce (E.P.).
12. Cardiology Unit, Campus Biomedico University, Rome (D.R.).
13. Cardiology Unit, Spedali Civili Brescia, Brescia (A.C.).
14. Cardiology and Arrhythmology Clinic, University Hospital “Umberto I-Salesi-Lancisi,” Ancona (A.D.R.).
15. Heart Rhythm Centre, Monzino Cardiology Centre, IRCCS, Milan, Italy (C.T.).
16. Cardiac Arrhythmia Center, Division of Cardiology at Montefiore-Einstein Center, Bronx, NY (L.D.B.).
17. Cardiology Unit, University Medical Center Mannheim, Germany (J.K.).
18. Cardiology, IRCCS, Department of Experimental, Diagnostic & Specialty Medicine, Sant’Orsola Hospital, University of Bologna, Bologna, Italy (M.B.).
19. Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK), Partner Site Hamburg/Kiel/Lübeck, Lübeck, Germany (R.T.).