1. Department of Clinical and Experimental Medicine, University of Messina, 98100 Messina, Italy
2. Department of Medical Translational Sciences, Division of Cardiology, Monaldi Hospital, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
3. Department of Medicine, University of Kentucky, Lexington, KY 40506, USA
4. Emergency Department, Rizzoli Hospital, Health Authority NA2, 80122 Napoli, Italy