1. Department of Otolaryngology-Head and Neck Surgery, National Hospital Organization Nagasaki Medical Center
2. Department of Neurosurgery, Nagasaki University Graduate School of Biomedical Sciences
3. Department of Otolaryngology-Head and Neck Surgery, Sasebo City General Hospital
4. Department of Otolaryngology-Head and Neck Surgery, Nagasaki University Graduate School of Biomedical Sciences
5. Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University