1. Department of Clinical Sciences and Community Health (M.M., V.C., M.A.M., P.B.-P., L.F.), University of Milan, and Endocrine Unit, Fondazione Istituto di Ricovero e Cura a Carattere Scientifico, Ca' Granda, 20122 Milan, Italy
2. Department of Pediatrics (S.R., M.C.V., I.Z., K.M., G.W.), San Raffaele Scientific Institute, Vita-Salute San Raffaele University, 21032 Milan, Italy
3. Metabolic Research Laboratories (N.S.), Wellcome Trust-Medical Research Council Institute of Metabolic Science, University of Cambridge, Cambridge CB2 0QQ, United Kingdom
4. Department of Pediatrics (L.B.), A. Manzoni Hospital, 73100 Lecco, Italy
5. Department of Pediatrics (F.G.), Perrino Hospital, 72100 Brindisi, Italy
6. Department of Clinical Genetics (S.-M.P.), Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
7. Department of Clinical Sciences and Community Health (L.P.), University of Milan, Milan, and Laboratory of Endocrine and Metabolic Research, Istituto Auxologico Italiano, 20149 Milan, Italy