1. Rheumatology Unit, Hospital das Clínicas - Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil
2. Hospital Risoleta Tolentino Neves, Belo Horizonte, Brazil
3. Dept. of Genetics, Ecology and Evolution - UFMG, Belo Horizonte, Brazil
4. Novartis, São Paulo, Brazil
5. Department of Statistics, Universidade Federal de Lavras (UFLA), Lavras, Brazil
6. Department of Biochemistry and Immunology UFMG, Belo Horizonte, Brazil