1. Laboratory of Clinical Pathology, Department of Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Kohrimoto, Kagoshima 890–0065, Japan
2. Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
3. Laboratory of Diagnostic Imaging, Department of Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Kohrimoto, Kagoshima 890–0065, Japan
4. Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Faculty of Agriculture, Iwate, 3–18–8 Ueda, Morioka, Iwate 020–8550, Japan