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