1. Unit of Internal Medicine, Scientific Institute, San Giovanni Rotondo, Italy
2. Department of Clinical Pharmacology and Epidemiology, Consorzio Mario Negri Sud, S. Maria Imbaro, Chieti, Italy
3. Department of Clinical and Experimental Medicine, 2nd University of Naples, Naples, Italy
4. Institut d'Investigacions Biomèdiques August Pi iSunyer (IDIBAPS) and Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain
5. Department of Internal Medicine, University of Messina, Messina, Italy
6. Diabetes and Metabolism Unit ASL Turin 5,
Chieri (TO
), Italy
7. Universita` degli Studi, IRCCS Azienda Ospedaliera Universitaria San Martino-IST, Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy