1. Department of Internal Medicine Hospital de Clínicas de Porto Alegre Porto Alegre Brazil
2. Graduate Program in Medical Sciences: Endocrinology Universidade Federal do Rio Grande do Sul Porto Alegre Brazil
3. Division of Endocrinology and Metabolism Hospital de Clínicas de Porto Alegre Porto Alegre Brazil
4. Faculty of Medicine Universidade Federal do Rio Grande do Sul Porto Alegre Brazil