1. Department of Veterinary Radiology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
2. Department of Veterinary Pathology, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
3. Department of Veterinary Small Animal Clinical Science, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi 753-8515, Japan
4. Department of Veterinary Surgery, Joint Faculty of Veterinary Science, Yamaguchi University, Yamaguchi-shi, Yamaguchi 753-8515, Japan