1. Department of Advanced Medical and Surgical Sciences, University of Campania “Luigi Vanvitelli,” Naples, Italy
2. Division of Endocrinology and Metabolic Diseases, University of Campania “Luigi Vanvitelli,” Naples, Italy
3. Medical Statistics Unit, University of Campania “Luigi Vanvitelli,” Naples, Italy
4. Unit of Diabetes, University of Campania “Luigi Vanvitelli,” Naples, Italy