1. Department of Clinical Sciences, University of Rome “La Sapienza,” Rome, Italy
2. Department of Endocrinology, University of Palermo, Palermo, Italy
3. Scientific Institute, Bambino Gesù Hospital, Rome, Italy
4. General Medicine, Diabetes, and Endocrinology, San Raffaele Scientific Institute and Vita Salute University, Milan, Italy
5. Department of Internal Medicine, University of Messina, Messina, Italy
6. Department of Internal Medicine, University of Perugia, Perugia, Italy
7. Department of Internal Medicine, Endocrine and Metabolic Sciences, and Biochemistry, University of Siena, Siena, Italy