Joseph A. Regezi, DDS, MS, Professor, Oral Pathology, University of California Division of Oral Pathology, San Francisco, CA, James Sciubba, DMD, PhD, Department of Otolaryngology - Head and Neck Surgery, Baltimore, MD, USA and Richard C. K. Jordan, DDS, MSc, PhD, FRCD(C), FRCPATH, University of California, San Francisco, San Francisco, CA