1. Postgraduate Program in Human Pathology; Oswaldo Cruz Foundation; Salvador Bahia Brazil
2. Department of Public Health; School of Dentistry; Federal University of Bahia; Salvador Bahia Brazil
3. Department of Oral Pathology; School of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Rio Grande do Sul Brazil
4. Laboratory of Surgical Pathology; School of Dentistry; Federal University of Bahia; Salvador Bahia Brazil
5. Department of Oral Pathology; School of Dentistry; University of São Paulo; São Paulo Brazil
6. Department of Periodontics; School of Dentistry; Federal University of Bahia; Salvador Bahia Brazil
7. Department of Medical and Surgical Sciences; University of Catania; Catania Italy