1. Department of Otolaryngology, School of Medicine, Showa University, Tokyo, Japan
2. Department of Physiology, School of Medicine, Showa University, Tokyo, Japan
3. Department of Physiology, School of Medicine, Showa University, 1–5-8 Hatanodai, Shinagawa-ku, Tokyo 142–8555, Japan
4. Department of Otolaryngology, Medical Academy, ul. Jaczew skiego 8, Lublin 20–090, Poland