1. From the Arrhythmia and Electrophysiology Center (R.C., F.F., V.G., T.I., P.L., M.P., S.F., G.D.A., H.A., E.B., G.B., L.D.A.), IRCCS Policlinico San Donato, Milan, Italy; Centro della Salute (R.R.), Baselga di Pine, Trento, Italy; the Clinical Epidemiology and Biometry Unit (C.R.), the Department of Cardiology (L.D.A.), and the Department of Cardiothoracic Anesthesia and Intensive Care (M.R.), IRCCS Policlinico San Donato, Università degli Studi Milano, Italy; and Sports Medicine and Science (A.P.),...