1. Division of Oral and Maxillofacial Surgery, Department of Reconstructive Oral and Maxillofacial Surgery, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan
2. Department of Oral and Maxillofacial Surgery, Iwate Prefectural Central Hospital, Morioka 020-0066, Japan
3. Division of Internal Medicine, Department of Oral Medicine, Iwate Medical University, Morioka 020-8505, Japan
4. Division of Clinical Pathology, Department of Oral and Maxillofacial Reconstructive Surgery, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan