1. From the Arrhythmology Department (C.P., G.V., G.C., F.M., M.S., R.V., A.C., L.G., Z.C., M.C., A.N., S.C., V.B., V.S.) and Cardiac Surgery Department (A.F., L.M.), IRCCS Policlinico San Donato, San Donato Milanese, Italy; Cardiology Department, Cardiovascular Institute, Hospital Clinic and IDIBAPS, Barcelona, Catalonia (J.B.); Cardiology Department, Hospital Trueta, Girona, Spain (R.B.); Department of Medical Sciences, University of Girona & IDIBGI, Spain (); Pediatric Arrhythmias,...