1. Division of Animal Medical Research, Hassen-kai, 2–27 Onozaki, Saito-shi, Miyazaki 881–0012, Japan
2. Aoba Animal Hospital, 92–1 Aoba-cho, Miyazaki 880–0842, Japan
3. Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113–8657, Japan
4. Kagoshima Animal College, 2–55–4 Higashitaniyama, Kagoshima 891–0113, Japan