1. Division of Oral and Maxillofacial Surgery , Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, , Morioka, Iwate , Japan
2. Iwate Medical University , Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, , Morioka, Iwate , Japan
3. Department of Oral Surgery, Hachinohe Red Cross Hospital , Hachinohe, Aomori , Japan
4. Division of Clinical Pathology , Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, , Shiwa-gun, Iwate , Japan
5. Iwate Medical University , Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, , Shiwa-gun, Iwate , Japan
6. Department of Pathology, Hachinohe Red Cross Hospital , Hachinohe, Aomori , Japan