Postgraduate Program in Dentistry, Federal University of Santa Catarina - Florianópolis, Santa Catarina, Brazil. Electronic address: fernanda.wmello@gmail.com. Postgraduate Program in Dentistry, Federal University of Santa Catarina - Florianópolis, Santa Catarina, Brazil. Department of Oral Medicine, King's College London and WHO Collaborating Centre for Oral Cancer, UK. Laboratory of Oral Histopathology, School of Health Sciences, University of Brasília, Brazil. Department of Pathology, Health Sciences Center, Federal University of Santa Catarina - Florianópolis, Santa Catarina, Brazil.