1. Department of Otoralyngology Head and Neck Surgery, Kagawa Prefectual Central Hospital
2. Department of Patholosy, Kagawa Prefectual Central Hospital
3. Department of Otoralyngology Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences
4. Department of Otoralyngology, Iwakuni Medical Center
5. Johoku ENT Clinic