1. Division of PathologyNational Institute of Health Sciences 3‐25‐26 Tonomachi, Kawasaki‐ku Kawasaki‐shi Kanagawa 210‐9501 Japan
2. Faculty of Animal Health TechnologyYamazaki University of Animal Health Technology 4‐7‐2, Minami‐osawa, Hachihoji Tokyo 192‐0364 Japan