Takaki Miwa1, Naoki Uramoto, Toshiaki Tsukatani, Mitsuru Furukawa. 1. Department of Otorhinolaryngology, Head and Neck Surgery, Kanazawa University, Graduate School of Medical Science, 13-1 Takaramachi, Kanazawa 920-8640, Japan. miwataka@orl.m.kanazawa-u.ac.jp