1. The School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimachi, Bunnkyoudai, Ebetsu, Hokkaido 069-8501, Japan
2. Arekinai Livestock Veterinary Clinic, Hokkaido Higashi Agricultural Mutual Aid Association, 177-3 Kita1senn, Aza Arekinaigenya, Shibecha-cho, Kawakami-gun, Hokkaido 088-2272, Japan
3. Ishigaki Bovine Hospital, Okinawa 907-0024, Japan
4. Hamanaka Livestock Veterinary Clinic, Hokkaido Higashi Agricultural Mutual Aid Association, 33 Chanai-Midori, Hamanaka-cho, Akkeshi-gun, Hokkaido 088-1361, Japan
5. Yubetsu Herd Management Service, 450-3 Baro, Yubetsu, Monbetsu-gun, Hokkaido 093-0731, Japan