[1] Chiba Univ, Dept Otorhinolaryngol & Head & Neck Surg, Chiba 2608670, Japan
[2] Yamagata Univ, Dept Otorhinolaryngol & Head & Neck Surg, Yamagata 990, Japan
[3] Okayama Univ, Dept Otorhinolaryngol, Okayama 7008530, Japan
[4] Saitama Med Univ, Dept Otorhinolaryngol Allergy, Moroyama, Saitama, Japan
[5] Nippon Med Sch, Dept Otorhinolaryngol & Head & Neck Surg, Tokyo, Japan
[6] Nagoya City Univ, Dept Otorhinolaryngol & Head & Neck Surg, Nagoya, Aichi, Japan
[7] Hiroshima Univ, Dept Otorhinolaryngol & Head & Neck Surg, Hiroshima 730, Japan
[8] Osaka Med Uinv, Dept Otorhinolaryngol, Osaka, Japan
[9] Iida Hosp, Dept Otorhinolaryngol, Iida, Nagano, Japan
[10] Iida Hosp, Dept Allergol, Iida, Nagano, Japan
[11] Akita Univ, Dept Otorhinolaryngol & Head & Neck Surg, Akita 010, Japan
[12] Nippon Med Sch, Dept Otorhinolaryngol, Musashikosugi Hosp, Tokyo, Japan
[13] Univ Fukui, Dept Otorhinolaryngol & Head & Neck Surg, Fukui, Japan
[14] Yuta Clin, Tsu, Mie, Japan
[15] Kyoto Univ, Dept Hlth Informat, Sch Publ Hlth, Kyoto 6068501, Japan