1. Dental School University Center of Pará Belém Pará Brazil
2. Department of Surgery and Oral Pathology João de Barros Barreto University Hospital Belém, Pará Brazil
3. Laboratory of Epithelial Biology Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor MI USA
4. Department of Restorative Sciences University of Michigan School of Dentistry Ann Arbor MI USA
5. Department of Oral Pathology School of Dentistry University of São Paulo São Paulo Brazil