1. Department of Otorhinolaryngology and Head and Neck Surgery, Osaka Prefectural Hospital Organization Osaka Habikino Medical Center
2. Department of Head and Neck Surgery, Kuma Hospital
3. Department of Otorhinolaryngology and Head and Neck Surgery, National Hospital Organization Osaka National Hospital
4. Department of pediatrics, Osaka Prefectural Hospital Organization Osaka Habikino Medical Center