1. Federal University of Minas Gerais (A.R.-O.), Belo Horizonte, MG, Brazil 30330-120;
2. Fundação Hospitalar do Estado de Minas Gerais (M.M.A.), Belo Horizonte, MG, Brazil 30150-260;
3. Department of Medicine, Divisions of Metabolism and Endocrinology (A.L.B.), Ann Arbor, Michigan 48016
4. Neurosurgery (A.L.B.), University of Michigan, Ann Arbor, Michigan 48016