1. Division of Endocrinology, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
2. Division of Endocrinology, University of Toronto, Toronto, Canada.
3. Department of Internal Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
4. Department of Endocrinology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.