1. Department of Otolaryngology-Head and Neck Surgery, Asahikawa Medical University, Asahikawa 0788510, Japan
2. Department of Innovative Head & Neck Cancer Research and Treatment (IHNCRT), Asahikawa Medical University, Asahikawa 0788510, Japan
3. Department of Pathology, Asahikawa Medical University, Asahikawa 0788510, Japan
4. Department of Pharmacology, Asahikawa Medical University, Asahikawa 0788510, Japan