1. Department of Preventive Medicine and Animal Health; Nihon University School of Veterinary Medicine; 1866 Kameino Fujisawa Kanagawa 252-8510 Japan
2. Kitagawa Animal Hospital; 1-39-1 Minamitokiwadai, Itabashiku Tokyo 174-0072 Japan
3. Department of Veterinary Physiology; Nihon University School of Veterinary Medicine; 1866 Kameino Fujisawa Kanagawa 252-8510 Japan