1. Department of Oral Pathology and Surgery; School of Dentistry, Universidade Federal de Minas Gerais; Belo Horizonte; Brazil
2. School of Dentistry, Universidade Vale do Rio Verde, UNINCOR, Belo Horizonte; Brazil
3. Department of Medical Clinic; School of Medicine, Universidade Federal de Minas Gerais; Belo Horizonte; Brazil