1. Pathology and Production Disease Group, Division of Hygiene Management, National Institute of Animal Health, National Agriculture and Food Research Organization, Hokkaido, Japan
2. Research Laboratory of Advanced Science & Technology, Corporate Research & Development, Asahi Kasei Corporation, Shizuoka, Japan
3. Shikaoi Veterinary Clinic, NOSAI Hokkaido, Hokkaido, Japan
4. Nippon Zenyaku Kogyo Corporation, Fukushima, Japan