Filippo Maria Cauti1, Pietro Rossi1, Philipp Sommer2. 1. Arrhythmology Unit, Ospedale San Giovanni Calibita, Fatebefratelli Isola Tiberina, Via Ponte Quattro Capi 39, Rome 00186, Italy. 2. Clinic for Electrophysiology, Herz-und Diabeteszentrum Nordrhein-Westfalen, Georgstr. 11, 32545 Bad Oeynhausen, Ruhr University Bochum, Germany.