1. Laboratory of Veterinary Pathology, School of Veterinary Medicine, Azabu University, 1–17–71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252–5201, Japan
2. Division of Human Morphology, Okayama University Medical School, 2–5–1 Shikata, Kitaku, Okayama 700–8558, Japan
3. 2nd Laboratory of Veterinary Internal Medicine, School of Veterinary Medicine, Nippon Veterinary and Life Science University, 1–7–1 Kyonan-cho, Musashino, Tokyo 180–8602, Japan