1. Kagoshima Prefectural Federation of Agricultural Mutual Aid Associations, Kagoshima 891–0132, Japan
2. Veterinary Medicine, Kitasato University, Aomori 034–8628, Japan
3. Kohiruimaki Animal Medical Service, Aomori 039–2683, Japan
4. Department of Veterinary Medicine, Kyoto Biken Laboratories, Kyoto 611–0041, Japan