1 Department of Molecular Medicine, Section of Cardiology, University of Pavia, Cardiac Intensive Care Unit, Arrhythmia and Electrophysiology and Experimental Cardiology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
2 Institute of Molecular Bioimaging and Physiology, National Research Council, IBFM-CNR, 90015 Cefalù, Italy; National Institute for Nuclear Physics, Laboratori Nazionali del Sud, INFN-LNS, 95123 Catania, Italy.
3 Department of Medical Sciences, Division of Cardiology, "Città della Salute e della Scienza di Torino" Hospital, University of Turin, Turin, Italy. Electronic address: gaetanomaria.deferrari@unito.it.