1 Department of Otolaryngology-Head & Neck Surgery, Kagawa Rosai Hospital, Kagawa, Japan; Department of Otolaryngology-Head & Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. Electronic address: [email protected].
2 Department of Otolaryngology-Head & Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
3 Department of Otolaryngology-Head & Neck Surgery, Kagawa Rosai Hospital, Kagawa, Japan.
4 Department of Otorhinolaryngology, Kagawa Prefectural Central Hospital, Takamatsu, Japan.
5 Department of Otorhinolaryngology, International University of Health and Welfare, School of Medicine, Narita, Japan.