[1] St Camillo Forlanini Hosp, Div Cardiol, Cardiac Arrhythmia Ctr, Cardiac Arrhythmia & Heart Failure Res Inst, I-00149 Rome, Italy
[2] Univ Roma La Sapienza, Dept Expt Med, I-00185 Rome, Italy
[3] St Camillo Forlanini Hosp, Cardiac Surg & Transplantat Ctr, I-00149 Rome, Italy