1. Divisions of Veterinary Biochemistry Nippon Veterinary and Animal Science University, 7-1 Kyonancho 1 chome, Musashino, Tokyo 180-8602, Japan
2. YCL Horse Clinic, 9-6 Kaminoda 6 chome, Urawa, Saitama 337-0977, Japan
3. Divisions of Veterinary Internal Medicine, Nippon Veterinary and Animal Science University, 7-1 Kyonancho 1 chome, Musashino, Tokyo 180-8602, Japan