1. Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine
2. Department of Otorhinolaryngology, Suita Municipal Hospital
3. Department of Otorhinolaryngology, Head and Neck Surgery, National Hospital Organization Osaka National Hospital
4. Department of Otorhinolaryngology, Head and Neck Surgery, Osaka General Medical Center
5. Department of Otorhinolaryngology, Head and Neck Surgery, Osaka Rosai Hospital
6. Department of Otorhinolaryngology, Minoh City Hospital