[1] ASST Fatebenefratelli Sacco, Div Endocrinol, I-20157 Milan, Italy
[2] Univ Milan, Int Ctr T1D, Pediat Clin Res Ctr Romeo & Enrica Invernizzi, Dept Biomed & Clin Sci L Sacco, I-20157 Milan, Italy
[3] Univ Milan, Pediat Clin Res Ctr Romeo & Enrica Invernizzi, DIBIC, I-20157 Milan, Italy
[4] Buzzi Childrens Hosp, Dept Pediat, I-20157 Milan, Italy
[5] Harvard Med Sch, Boston Childrens Hosp, Nephrol Div, Boston, MA 02115 USA