1. From the Arrhythmia and Electrophysiology Unit (F.Z., E.B., G.P.), Division of Cardiology (C.F., L.R., S.A.), and Department of Internal Medicine (A.M.), Santa Maria Della Misericordia Hospital, Rovigo, Italy; Department of Molecular Medicine, of Padua, Padua, Italy (F.N.); and Cardiovascular Research Institute Maastricht, Maastricht University Medical Center, Maastricht, The Netherlands (F.P.).