1. Department of Radiation Oncology, Hyogo Cancer Center
2. Department of Therapeutic Radiation Oncology, Aichi Cancer Center Hospital
3. Department of Clinical Oncology, Jichi Medical University
4. Clinical Research Institute, National Hospital Organization Kyushu Cancer Center
5. Department of Otorhinolaryngology, National Hospital Organization Kyushu Medical Center
6. Department of Head and Neck Surgery, National Hospital Organization Shikoku Cancer Center
7. Division of Gastrointestinal Oncology, Shizuoka Cancer Center
8. Department of Otolaryngology-Head and Neck Surgery, Hokkaido University Graduate School of Medicine
9. Department of Medical Oncology, Kindai University Nara Hospital
10. Division of Radiation Oncology and Particle Therapy, National Cancer Center Hospital East