1. Endocrine Unit (S.C., S.T., H.J., M.B.), Department of Pediatrics, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114;
2. Department of Medicine, and Pediatric Nephrology Unit (S.C., H.J.), Department of Pediatrics, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114;
3. Department of Pediatric Endocrinology (S.T.), Marmara University School of Medicine, 34722 Istanbul, Turkey;
4. Department of Nephrology (D.-Y.H., H.-C.C.), Kaohsiung Medical University Hospital, Kaohsiung Medical University, 80708 Kaohsiung, Taiwan