1. Department of Small Animal Clinical Sciences, School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai Midorimach, Ebetu-shi, Hokkaido 069–8501, Japan
2. Department of Veterinary Pathology, School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai Midorimach, Ebetu-shi, Hokkaido 069–8501, Japan
3. Animal Clinical Research Foundation, 214–10 Yatsuya, Kurayoshi-shi, Tottori 682–0025, Japan
4. Japan Animal Referral Medical Center, 5–8 Kuji, Takatsu-ku, Kawasaki-shi, Kanagawa 213–0032, Japan