1. Department of Medical Sciences, IRCSS Casa Sollievo della Sofferenza—Clinical Unit of Endocrinology, San Giovanni Rotondo, Italy
2. IRCSS Casa Sollievo della Sofferenza-Mendel Laboratory, San Giovanni Rotondo, Italy
3. Department of Medical Sciences, University of Foggia, Foggia, Italy
4. Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
5. Research Division, Joslin Diabetes Center, Boston, MA, USA
6. Department of Medicine, Harvard Medical School, Boston, MA, USA
7. Cardiovascular Division, Beth Israel Deaconess Medical Center, Boston, MA, USA
8. IRCCS Casa Sollievo della Sofferenza—Research Unit of Diabetes and Endocrine Diseases, San Giovanni Rotondo, Italy
9. Department of Experimental Medicine, ‘Sapienza’ University, Rome, Italy