1. From Metabolism and Diabetes Unit (C.B.G.), ASL 8, Regione Piemonte, Chieri, Italy; Division of Metabolic Diseases (A.A.), University of Padova, Italy; National Institute of Health (M.M., F.L., S.S.A., R.R.), Rome, Italy; University of Florence and Azienda Ospedaliera Careggi (E.M.), Florence, Italy; Federico II University (S.T.), Naples, Italy; Casa di Cura Pineta del Carso (M.V.), Aurisina, Trieste, Italy; University of Pisa School of Medicine (E.F.), Pisa, Italy.