1. Department of Oral Diagnosis, Piracicaba Dental School; Campinas State University (UNICAMP); São Paulo; Brazil
2. Academic Unit of Oral and Maxillofacial Pathology, School of Clinical Dentistry; University of Sheffield; Sheffield; UK
3. Head and Neck Pathology Section; Centro Clínico de Cabeza y Cuello/Hospital Herrera-Llerandi; Guatemala City; Guatemala