1. Department of Oral and Maxillofacial Pathology, Postgraduate and Research Division Universidad Nacional Autónoma de México Mexico City Mexico
2. Department of Oral and Maxillofacial Pathology Universidad El Bosque Bogota Colombia
3. School of Dentistry Centro Universitario do Estado do Para Belem Brazil
4. Faculty of Dentistry, Postgraduate Unit Universidad Nacional Mayor de San Marcos Lima Peru