[1] Univ Pisa, Dept Clin & Expt Med, Sect Diabet & Metab Dis, Pisa, Italy
[2] Azienda Osped Univ Pisana, Pisa, Italy
[3] Reg Hlth Agcy ARS Tuscany, Epidemiol Unit, Florence, Italy
[4] Fdn IRCCS Casa Sollievo Sofferenza, Res Unit Diabet & Endocrine Dis, San Giovanni Rotondo, Italy