1. Laboratory of Veterinary Hygiene, School of Veterinary Science, Nippon Veterinary and Life Science University, Tokyo 180‑8602, Japan
2. Research Center for Animal Life Science, Nippon Veterinary and Life Science University, Tokyo 180‑8602, Japan
3. Laboratory of Laboratory Animal Science and Medicine, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060‑0818, Japan
4. Laboratory of Veterinary Pathology, Gifu University, Gifu 501‑1193, Japan
5. Laboratory of Anatomy II, Department of Veterinary Medicine, Azabu University, Sagamihara-shi, Kanagawa 252‑5201, Japan
6. School of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Tokyo 180‑8602, Japan
7. Laboratory of Clinical Oncology, Tokyo University of Agriculture and Technology, Tokyo 183‑8538, Japan
8. Division of Physiological Pathology, Nippon Veterinary and Life Science University, Tokyo 180‑8602, Japan
9. Department of Urology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700‑0914, Japan