[1] Integrated Oncol Ctr Ana Nery Hosp, Santa Cruz Do Sul, RS, Brazil
[2] Univ Sheffield, Acad Unit Oral & Maxillofacial Med & Pathol, Dept Clin Dent, Sheffield, S Yorkshire, England
[3] Univ Fed Rio Grande do Sul, Sch Dent, Dept Oral Pathol, Porto Alegre, RS, Brazil
[4] Porto Alegre Clin Hosp HCPA UFRGS, Dept Oral Med, Porto Alegre, RS, Brazil