1. University of Florence; Florence Italy
2. Division of Cardiology, Massachusetts General Hospital; Harvard Medical School; Boston USA
3. Texas Cardiac Arrhythmia Institute; Austin USA
4. Fondazione Monasterio; Pisa Italy
5. Gavazzeni Hospital; Bergamo Italy
6. Bloch Heart Rhythm Center, Division of Cardiovascular Diseases, Cardiovascular Research Institute; University of Kansas Hospital & Medical Center; Kansas City Kansas USA
7. IRCCS MultiMedica; Milano Italy