1. Endocrine Unit, INRCA, Via Cassia 1167, 00189 Rome, Italy
2. Department of Clinical and Experimental Medicine, Second University of Naples, Via Pansini 5, 80131 Naples, Italy
3. Endocrinology and Diabetes Service, FBF St. Peter's Hospital, Via Cassia 600, 001879 Rome, Italy
4. DipTeRis, University of Genoa, Viale Benedetto XV 3, 16132 Genoa, Italy