1. Department of Oral Diagnosis Piracicaba Dental School University of Campinas São Paulo Brazil
2. Academic Unit of Oral and Maxillofacial Medicine and Pathology Department of Clinical Dentistry University of Sheffield Sheffield UK
3. Department of Oral Pathology School of Dentistry Federal University of Rio Grande do Sul Porto Alegre Brazil
4. Clinical Oncology Service, São Paulo State Cancer Institute (ICESP) School of Medicine of the University of São Paulo São Paulo Brazil
5. Department of Head and Neck Surgery, Faculty of Medicine, Head and Neck Surgery and Otorhinolaryngology Department, A C Camargo Cancer Center Universidade de São Paulo São Paulo Brazil
6. Department of Cariology, Restorative Sciences, Endodontics, School of Dentistry University of Michigan Ann Arbor Michigan USA
7. Laboratory of Epithelial Biology Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor Michigan USA