1. Postgraduate Programme in Dentistry; Federal University of Piauí (UFPI); Teresina Brazil
2. Department of Morphology; Federal University of Piauí (UFPI); Teresina Brazil
3. Department of Clinic and Veterinary Surgery; Federal University of Piauí (UFPI); Teresina Brazil
4. Postgraduate Programme in Pathology; University of São Paulo (USP); São Paulo Brazil
5. Department of Pathology and Dentistry Clinic; Federal University of Piauí (UFPI); Teresina Brazil