1. Department of Otorhinolaryngology, Graduate School of Medicine, Keio University, Tokyo 160-8582, Japan
2. Department of Otorhinolaryngology, Head and Neck Surgery, Keio University School of Medicine, Tokyo 160-8582, Japan
3. Division of Research and Development, Research Organization of Biological Activity, Tokyo 160-0016, Japan
4. Center of Kampo Medicine, Keio University School of Medicine, Tokyo 160-0016, Japan
5. Faculty of Environmental and Information Study, Keio University, 5322 Endo, Fujisawa, Kanagawa 252-0882, Japan