1. Department of Clinical Veterinary Science, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-shi, Yamaguchi 753-8515, Japan
2. Otokuni Animal Hospital, 26 Shimokaiinji, Nagaokakyo-shi, Kyoto 617-0845, Japan
3. Department of Advanced Clinical Medicine, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-Oraikita, Izumisano-shi, Osaka 598-8531, Japan