1 Istituto Auxologico Italiano, IRCCS, Dipartimento di Scienze Cardiovascolari, Neurologiche, Metaboliche, Ospedale S. Luca, Milano, Italy. Electronic address: perego@auxologico.it.
2 Heart Rhythm Center, Centro Cardiologico Monzino, IRCCS, Milan, Italy; Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.