1. 1Division of Cardiology, Buccheri La Ferla Fatebenefratelli Hospital, Palermo, Italy
2. 2Division of Cardiology “P. Borsellino” G.F. Ingrassia Hospital, Palermo, Italy
3. 3Districtual Cardiology ASL 6, Palermo, Italy
4. 4Department of Internal Medicine, University of Palermo, Palermo, Italy