1. Endocrinology and Metabolism Laboratory (T.S.-P., V.P., B.E., M.M., A.L.d.G., J.P., N.C., F.S.), School of Medicine, University of Chile, Santiago 8320000, Chile
2. West Division, and Institute of Maternal and Child Research (E.C., F.C.), School of Medicine, University of Chile, Santiago 8320000, Chile
3. Boston University School of Medicine (S.B.), Boston Medical Center, Boston, Massachusetts 02118