1. Department of Otolaryngology, Nakamura Memorial Hospital
2. Department of Otorhinolaryngology, Cognitive and Speech Medicine, Nagoya University Graduate School of Medicine
3. Department of Otolaryngology, Ebara Hospital
4. Department of Otolaryngology, The University of Tokyo
5. Department of Sensory and Motor Organs, Division of Otolaryngology-Head and Neck Surgery, Faculty of Medicine, Tottori University
6. Department of Otorhinolaryngology, Head and Neck Surgery, Kagawa University Hospital
7. Department of Laryngology, Swallowing Center, Seirei Sakura Citizen Hospital
8. Department of Public Health, Sapporo Medical University School of Medicine