1. Laboratory of Autoimmune Diseases, Division of Rheumatology, Clinical Hospital of Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
2. School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
3. Department of Surgical Pathology, Clinical Hospital of Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
4. Laboratory Research Unit, Center for Experimental Research, Clinical Hospital of Porto Alegre, Porto Alegre, Brazil