1. Chairman of 2nd OLP Working Group (OLP Committee), Japanese Association of Oral Medicine
2. Department of Oral and Maxillofacial Surgery, Dokkyo Medical University School of Medicine
3. Vice chairman of 2nd OLP Working Group (OLP Committee), Japanese Association of Oral Medicine
4. Committee member of 2nd OLP Working Group (OLP Committee), Japanese Association of Oral Medicine
5. Member of The Japanese Society of Oral Pathology