1. Department of Oral Pathology, School of Dentistry, Health Sciences Center, Federal University of Rio Grande do Norte, Lagoa Nova, Natal, RN,
2. University of the State of Paraíba, Campina Grande, PB
3. Hospital Dr. Luiz Antonio, Rua Mário Negócio, Quintas, Natal, RN Brazil
4. Department of Oral Pathology, School of Dentistry, Health Sciences Center, Federal University of Rio Grande do Norte, Lagoa Nova, Natal, RN