1. Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Medicine, School of Veterinary Medicine Faculty of Veterinary Science, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo 180-8602, Japan
2. Livestock Medical Training Center, Miyagi Prefecture Agricultural Mutual Aid Association, 39-4 Hirabayashi, Ohira, Kurokawa-gun, Miyagi 981-3602, Japan