1. Department of Oral Diagnosis, Piracicaba Dental School University of Campinas Piracicaba São Paulo Brazil
2. Pathology Department Centro Clinico de Cabeza y Cuello Guatemala City Guatemala
3. Oral Pathology, Department of Oral Diagnosis and Pathology, School of Dentistry Federal University of Rio de Janeiro Rio de Janeiro Brazil
4. Department of Oral Pathology, School of Clinical Dentistry University of Sheffield Sheffield UK
5. Department of Oral Pathology and Oral Biology, School of Dentistry, Faculty of Health Sciences University of Pretoria Pretoria South Africa