1 Division of Cardiology, Department of Cardiothoracic and Respiratory Sciences, University of Campania "Luigi Vanvitelli", A.O. dei Colli Monaldi Hospital, L. Bianchi 1,Naples 80131, Italy.
2 Division of Cardiology, Laboratory of Interventional Cardiology, San Giovanni Evangelista Hospital, Via Parrozzani 3,Tivoli, Rome 00019, Italy.