1. Laboratory of Veterinary Pathology, Azabu University, 1–17–71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252–5201, Japan
2. Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, 3–5–8 Saiwai-cho, Fuchu, Tokyo 183–8509, Japan
3. Itozu no Mori Zoological Park, 4–1 Kamiitozu, Kokurakita-ku, Kitakyushu, Fukuoka 803–0845, Japan