1. Internal Medicine & Hepatology Unit, University Hospital of Palermo, PROMISE, University of Palermo, 90127 Palermo, Italy
2. Internal Medicine and Diabetology Unit, University of Messina, 98125 Messina, Italy
3. Internal Medicine and Hepatology Unit, University Hospital of Messina, 98124 Messina, Italy
4. Department of Clinical and Experimental Medicine, University of Messina, 98124 Messina, Italy