1. United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan
2. Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan
3. Nippon Zenyaku Kogyo Co., Ltd., Fukushima 963-0196, Japan
4. Institute of Agriculture and Animal Science, Tribhuvan University, Chitwan, Nepal
5. Biei Veterinary Clinical Center, Kamikawa Chuo Agricultural Mutual Aid Association, Hokkaido 071-0200, Japan