YOKOO Satoshi¹, MAEDA Hatsuhiko² (1.Department of Oral and Maxillofacial Surgery, and Plastic Surgery, Gunma University Graduate School of Medicine, 2.Department of Oral Pathology, School of Dentistry, Aichi Gakuin University)

HAYASHI Takafumi (Division of Oral and Maxillofacial Radiology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan)

NAGATSUKA Hitoshi¹ (1.Department of Oral Pathology and Medicine, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan, 2.The Committee of Diagnostic Criteria for Oral Cancers, The Japanese Society of Oral Pathology)

OTA Yoshihide^1,2 (1.Department of Pral and Maxillofacial Surgery, Tokai University, School of Medicine, Kanagawa, Japan, 2.Comittee for General Rules for Clinical and Pathological Studies on Oral Cancer, Japanese Society of Oral Oncology, Tokyo, Japan)

NAKAMURA Seiji (Section of Oral and Maxillofacial Oncology, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science, Kyushu University, Fukuoka, Japan)