1. Department of Clinical and Experimental Medicine; University of Messina; Messina Italy
2. Metabolism and Diabetes Unit ASL TO5; Chieri Italy
3. MSD; Rome Italy
4. Unit of Internal Medicine, Department of Medical Sciences; IRCCS Casa Sollievo della Sofferenza; San Giovanni Rotondo Italy
5. Center for Outcomes Research and clinical Epidemiology (CORE); Pescara Italy