1. Department of Otolaryngology, Tokyo Metropolitan Ohtsuka Hospital, Tokyo, Japan 2-8-1, Minamiohtsuka, Toshima-ku, Tokyo 170, Japan
2. Department of Otolaryngology, Keio University School of Medicine, Tokyo, Japan 35, Shinanomachi, Shinjuku-ku, Tokyo 160, Japan
3. Department of Otolaryngology, Juntendo University School of Medicine, Tokyo, Japan 2-1-1, Hongo, Bunkyo-ku, Tokyo 113, Japan