Vincenzo Trischitta1, Rosa Di Paola2. 1. Research Unit of Diabetes and Endocrine Diseases, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo, Italy; Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy. Electronic address: vincenzo.trischitta@uniroma1.it. 2. Research Unit of Diabetes and Endocrine Diseases, IRCCS "Casa Sollievo della Sofferenza", San Giovanni Rotondo, Italy. Electronic address: r.dipaola@operapadrepio.it.