[1] Univ Naples Federico II, Dept Publ Hlth, Via Sergio Pansini 5, I-80131 Naples, Italy
[2] Univ Perugia, Sect Occupat Med Resp Dis & Toxicol, Dept Med, Perugia, Italy
[3] Univ Roma Tor Vergata, Dept Biomed & Prevent, Rome, Italy
[4] Azienda Sociosanit Terr Papa Giovanni XXIII, Unit Occupat Med, Bergamo, Italy
[5] Univ Bari Aldo Moro, Sect Occupat Med EC Vigliani, Interdisciplinary Dept Med, Bari, Italy
[6] Osped Maggiore Policlin, Clin Lavoro L Devoto, Occupat Hlth Unit, Dept Hlth Serv & Prevent Med, Milan, Italy
[7] Azienda Sociosanit Terr Papa Giovanni XXIII, Unit Endocrinol & Diabetol, Bergamo, Italy
[8] AO Citta Salute & Sci Torino Ant Sede, Ctr Unificato Diabetol, Turin, Italy
[9] ASLT04, SS Diabetol, Chivasso, Italy
[10] Paolo Borsellino Hosp, Diabet Unit, Marsala, Italy
[11] Univ Catania, Garibaldi Nesima Hosp, Dept Clin & Expt Med, Endocrinol, Catania, Italy
[12] ASST Spedali Civili, UO Diabetol, Brescia, Italy