1. Department of Applied Science, School of Veterinary Nursing and Technology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, 1-7-1 Kyounan, Musashino, Tokyo 180-8602, Japan
2. Laboratory of Bimolecular Chemistry, School of Veterinary Medicine, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, 1-7-1 Kyounan, Musashino, Tokyo 180-8602, Japan
3. Minowa Horse Clinic, 4-4-5, Higashikoujiya, Oota, Tokyo144-0033, Japan
4. Department of Otolaryngology, Graduate School of Medicine, Nippon Medical School, Tokyo 113-8602, Japan