1. Division of Oral and Maxillofacial Surgery, Department of Oral and Macillofacial Reconstructive Surgery, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan
2. Division of Clinical Pathology, Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan