1. Division of Cardiology, A.O.U. ‘Policlinico-Vittorio Emanuele’, University of Catania, P.O. Rodolico, Ed. 8, Via Santa Sofia 78, 95123 Catania, Sicilia, Italy
2. Division of Cardiology, A.O.U. ‘Policlinico-Vittorio Emanuele’, University of Catania, Catania, Sicilia, Italy
3. Division of Cardiology, Department of Medicine, University of Florida College of Medicine, Jacksonville, FL, USA