1. Department of Clinical Sciences, Sapienza University, Rome, Italy
2. Sandro Pertini Hospital, Rome, Italy
3. Endocrinology, Catholic University, Rome, Italy
4. General Medicine, Diabetes and Endocrinology, San Raffaele Vita-Salute University, Milan, Italy
5. Department of Endocrinology and Metabolism, University of Cagliari, Cagliari, Italy
6. Endocrinology, University Campus Bio-Medico, Rome, Italy
7. Department of Internal Medicine, University of Perugia, Perugia, Italy