1. Division of Endocrinology, Diabetes, and Hypertension (A.P.A., S.D.N., S.X., R.S.C., U.B.K.), Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115;
2. Developmental Endocrinology Unit (A.P.A., A.C.L.), Laboratory of Hormones and Molecular Genetics, Teaching Hospital of the University of São Paulo Medical School, São Paulo 05403, Brazil