Experimental Medicine Department, Sant'Andrea Hospital, "Sapienza" University of Rome, Italy. Electronic address: chiara.giul@gmail.com. S.S.D. di Endocrinologia e Malattie del Ricambio, "ASFO" Pordenone, Italy. Diabetology and Metabolic Diseases Unit, ULSS 8 Vicenza, Italy. Metabolism and Diabetes Unit, ASL TO4 Chivasso, TO, Italy. Department of Clinical and Experimental Medicine, University of Messina, Italy. Endocrinology, Diabetes, Metabolism and Clinical Nutrition, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy. Rete Clinica di Diabetologia Aziendale, Dipartimento Internistico di Ravenna, A.Usl della Romagna, Italy. Clinical and Molecular Medicine Department, Sant'Andrea Hospital, "Sapienza" University of Rome, Italy.