1 Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
2 Department of Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, Sao Paulo, Brazil.
3 Department of Periodontics and Oral Medicine, Laboratory of Epithelial Biology, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA.
4 University of Michigan Rogel Cancer Center, Ann Arbor, Michigan, USA.