1. Kakinuma Veterinary Hospital, 200-1 Kodama, Kodama-chou, Honjou, Saitama 367-0212
2. Kohiruimaki Animal Medical Service, Tohoku, Aomori 039-2683
3. Miyagi Prefectural Federated Agricultural Mutual Aid Association, Shiroishi, Miyagi, 989-0731
4. Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818
5. School of Veterinary Medicine, Kitasato University, Towada, Aomori 034- 8628
6. School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan