1. Department of Clinical Pharmacology and Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri, Consorzio Mario Negri Sud, S. Maria Imbaro, Italy
2. TUFTS University, Boston, Massachusetts
3. Centro Studi e Ricerche in Medicina Generale, Monza, Italy
4. University of Medicine of Chieti and Diabetes Outpatient Clinic, General Hospital, Pescara
5. Diabetes Outpatient Clinic, General Hospital, Arenzano
6. Insitute of Internal Medicine, Endocrine and Metabolic Science, University of Perugia, Perugia
7. Diabetes Outpatient Clinic, General Hospital, Udine
8. Diabetes Outpatient Clinic, General Hospital, S. Benedetto del Tronto, Italy