1 Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
2 Department of Immunology, Science Biological Institute, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.
3 Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, São Paulo, Brazil; Department of Oral Pathology and Oral Biology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa. Electronic address: [email protected].