[1] Univ Pisa, Dept Endocrinol & Metab, Sect Diabet & Metab Dis, I-56124 Pisa, Italy
[2] Mario Negri Sud Consortium, Dept Clin Pharmacol & Epidemiol, Santa Maria Imbaro, Italy
[3] San Gerardo Hosp Monza, Ctr Diabet, Cusano Milanino, Italy
[4] Univ Naples Federico II, Dept Clin & Expt Med, Naples, Italy
[5] Sandro Pertini Hosp, Rome B, Italy
[6] Madonna del Soccorso Hosp, Diabetol & Metab Disorders Ctr, San Benedetto Tronto, Italy