1. Hokkaido Tokachi Livestock Hygiene Service Center, 59–6 Kisen, Kawanishicho, Obihiro, Hokkaido 089–1182, Japan
2. Tokachi Draft Horse Clinic, Nishi 13, Minami 9–1, Obihiro, Hokkaido 080–0023, Japan
3. Epizootic Research Center, Equine Research Institute, Japan Racing Association, 1400–4 Shiba, Shimotsuke, Tochigi 329–0412, Japan