1. Laboratory of Veterinary Internal Medicine, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido, Japan
2. Neovets Veterinary Referral Center, Nakamichi, Higashinari-ku, Osaka-shi, Osaka, Japan
3. Department of Veterinary Pathology, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido, Japan