1. Division of Oral and Maxillofacial Surgery, Department of Reconstructive Oral and Maxillofacial Surgery Iwate Medical University, School of Dentistry Morioka Iwate Japan
2. Head and Neck Cancer Center Iwate Medical University Hospital Yahaba Iwate Japan
3. Department of Otolaryngology‐Head and Neck Surgery Iwate Medical University, School of Medicine Yahaba Iwate Japan