[1] Univ Campinas UNICAMP, Piracicaba Dent Sch, Dept Oral Diag, Piracicaba, SP, Brazil
[2] Univ Campinas UNICAMP, Dept Pathol, Fac Med Sci, Campinas, SP, Brazil
[3] Univ Michigan, Sch Dent, Dept Periodont & Oral Med, Lab Epithelial Biol, Ann Arbor, MI 48109 USA
[4] Univ Michigan, Rogel Canc Ctr, Ann Arbor, MI 48109 USA