1 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: hcho@ent.med.osaka-u.ac.jp.
2 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: tkishikawa@ent.med.osaka-u.ac.jp.
3 Department of Mathematical Health Science, Osaka University Graduate School of Medicine, Suita, Japan; Department of Nursing, Kyoto Tachibana University, Kyoto, Japan. Electronic address: tokita@tachibana-u.ac.jp.
4 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: msuzuki@ent.med.osaka-u.ac.jp.
5 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: ntakemoto@ent.med.osaka-u.ac.jp.
6 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: hanamoto@med.osakacity-hp.or.jp.
7 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: tfukusumi@ent.med.osaka-u.ac.jp.
8 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: myamamoto@ent.med.osaka-u.ac.jp.
9 Department of Mathematical Health Science, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: m.fujii@sahs.med.osaka-u.ac.jp.
10 Department of Mathematical Health Science, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: ohno@sahs.med.osaka-u.ac.jp.
11 Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Suita, Japan. Electronic address: hinohara@ent.med.osaka-u.ac.jp.