About the Authors

Maiko Miyagawa

Affiliation Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan

Shin-ya Nishio

Affiliation Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan

Takuo Ikeda

Affiliation Department of Otolaryngology, Tsudumigaura Handicapped Children’s Hospital, Shunan, Japan

Kunihiro Fukushima

Affiliation Department of Otorhinolaryngology, Okayama University School of Medicine, Okayama, Japan

Shin-ichi Usami

usami@shinshu-u.ac.jp

Affiliation Department of Otorhinolaryngology, Shinshu University School of Medicine, Matsumoto, Japan

Competing Interests

All authors declare no competing interests.

Author Contributions

Conceived and designed the experiments: SU. Performed the experiments: MM SN. Analyzed the data: MM SN. Contributed reagents/materials/analysis tools: MM TI KF. Wrote the paper: SU.