1. Diabetes Centre, Padova, Italy
2. Diabetes Centre, Arenzano (GE), Italy
3. Diabetes Centre, Udine, Italy
4. Pediatric Department, Second University of Napoli, Napoli, Italy
5. Institute of Internal Medicine, Endocrinology and Metabolism Disease, Catania, Italy
6. Department of Clinical Pharmacology and Epidemiology, Consorzio Mario Negri Sud, S. Maria Imbaro (CH), Italy
7. LifeScan, Milan, Italy.