[1] Univ Pisa, Dept Endocrinol & Metab, I-56100 Pisa, Italy
[2] Univ Pisa, Dept Internal Med, I-56100 Pisa, Italy
[3] Univ Verona, Div Endocrinol & Metab Dis, I-37100 Verona, Italy
[4] Univ Siena, Diabet Unit, I-53100 Siena, Italy
[5] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Endocrinol & Diabet Unit, Milan, Italy
[6] Ist Sci San Raffaele, Complicat Diabet Unit, I-20132 Milan, Italy
[7] Ospedali Riuniti, Endocrinol & Diabet Unit, Bergamo, Italy
[8] Univ Padua, Dept Clin & Expt Med, I-35100 Padua, Italy
[9] Univ Turin, Dept Internal Med, I-10124 Turin, Italy
[10] Univ Foggia, Dept Med Sci, Foggia, Italy
[11] Univ Cagliari, Dept Med Sci, I-09124 Cagliari, Italy
[12] Univ Roma La Sapienza, Dept Clin & Mol Med, I-00185 Rome, Italy