1. IRCCS Casa Sollievo della Sofferenza, Clinical Unit of Endocrinology, San Giovanni Rotondo, Italy
2. IRCCS Casa Sollievo della Sofferenza, Mendel Laboratory, San Giovanni Rotondo, Italy
3. Unit of Endocrinology, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
4. Department of Cinical and Experimental Medicine, University of Pisa, Pisa, Italy
5. Research Division, Joslin Diabetes Center, Boston, MA, USA
6. Unit of Biostatistics, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy
7. Unit of Biostatistics, Consorzio Mario Negri Sud, Santa Maria Imbaro, Italy
8. Harvard Medical School, Boston, MA, USA
9. IRCCS Casa Sollievo della Sofferenza—Research Unit of Diabetes and Endocrine Diseases, San Giovanni Rotondo, Italy
10. Department of Experimental Medicine, ‘Sapienza’ University, Rome, Italy