1. Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, 535–13 Nishicha, Urakawa-cho, Urakawa-gun, Hokkaido 057–0171, Japan
2. Miyazaki Training Farm, Japan Racing Association, 2347 Oharu, Hanagashima-cho, Miyazaki-shi, Miyazaki, 880–0036, Japan
3. Oiwake Farm, 1233–1 Kohyo, Oiwake, Abira-cho, Yuhfutsu-gun, 059–1984, Japan
4. Laboratory of Clinical Science and Pathobiology, Equine Research Institute, Japan Racing Association, 321–4 Tokami-cho, Utsunomiya, Tochigi, 320–0856, Japan
5. Hidaka Horse Breeders Association, 2–4–4 Tsukiji, Urakawa-cho, Urakawa-gun, Hokkaido 057–0024, Japan