[1] Hosp Clin Porto Alegre, Serv Reumatol, Lab Doencas Autoimunes, Porto Alegre, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Porto Alegre, RS, Brazil
[3] Univ Fed Parana, Hosp Clin, Curitiba, Parana, Brazil
[4] Univ Fed Minas Gerais, Fac Med, Lab Interdisciplinar Invest Med, Belo Horizonte, MG, Brazil