1. Endocrinology and Metabolism Laboratory (N.C., M.M., B.E., F.S., T.S.-P.), School of Medicine, University of Chile, Casilla 33052, Correo 33, Santiago, Chile
2. West Division, and Institute of Maternal and Child Research (E.C., F.C.), School of Medicine, University of Chile, Casilla 33052, Correo 33, Santiago, Chile