1. Department of Otolaryngology, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
2. Department of Head and neck Surgery, Osaka International Cancer Institute, Osaka, Japan
3. Department of Otolaryngology-Head and neck Surgery, Osaka University School of Medicine, Osaka, Japan
4. Department of Physiology, International University of Health and Welfare School of Medicine, Narita, Japan