1. Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.
2. AMD Foundation, Roma, Italy.
3. G. Segalini H. Bassini Cinisello Balsamo ASST Nord, Milan, Italy.
4. CORESEARCH, Center for Outcomes Research and Clinical Epidemiology, Pescara, Italy.
5. Department of Human Pathology of Adulthood and Childhood “G. Barresi,” University of Messina, Messina, Italy.
6. Diabetes Unit, Local Healthcare Authority of Romagna, Ravenna, Italy.
7. Department of Medical Sciences, Scientific Institute “Casa Sollievo della Sofferenza,” San Giovanni Rotondo, Italy.
8. Department of Medical Surgical and Health Sciences, University of Trieste, Diabetes Center, ASUGI, Trieste, Italy.
9. ASL North-West Tuscany, Diabetes and Metabolic Diseases, Livorno Hospital, Livorno, Italy.