1. Department of Veterinary Nursing and Technology, School of Veterinary Science, Nippon Veterinary and Life Science University, 1–7–1 Kyonancho, Musashino, Tokyo 180–8602, Japan
2. Department of Veterinary Medicine, School of Veterinary Science, Nippon Veterinary and Life Science University, 1–7–1 Kyonancho, Musashino, Tokyo 180–8602, Japan
3. Nikkiso Co., Ltd., 4–20–3 Ebisu, Shibuya-ku, Tokyo 150–6022, Japan