1. Endocrinology and Metabolism Laboratory, West Division (T.S.-P., M.C., C.H., M.M., B.E., P.A., N.C.), School of Medicine, University of Chile, 8320000 Santiago, Chile
2. Institute of Maternal and Child Research (L.M., E.C., F.C.), School of Medicine, University of Chile, 8320000 Santiago, Chile