K Endo1, K Kase2, T Yoshizaki2. 1. Division of Otolaryngology, Graduate School of Medicine, 13-1 Takara-machi, Kanazawa University, 920-8641 Kanazawa, Japan. Electronic address: endok@med.kanazawa-u.ac.jp. 2. Division of Otolaryngology, Graduate School of Medicine, 13-1 Takara-machi, Kanazawa University, 920-8641 Kanazawa, Japan.