1. Laboratory of Veterinary Diagnostic Imaging, Department of Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan
2. Animal Medical Center and Laboratory of Veterinary Internal Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3–5–8 Saiwai-cho, Fuchu, Tokyo 183–8509, Japan
3. Laboratory of Veterinary Internal Medicine, Department of Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, 1–21–24 Korimoto, Kagoshima 890–0065, Japan