1. Clinical Science and Pathobiology Division, Equine Research Institute, Japan Racing Association, Tochigi 320-0856, Japan
2. Epizootic Research Center, Equine Research Institute, Japan Racing Association, Tochigi 329-0412, Japan
3. Racehorse Hospital, Ritto Training Center, Japan Racing Association, Shiga 520-3085, Japan
4. Kyushu Stallion Station, The Japan Bloodhorse Breeders’ Association, Kagoshima 899-8313, Japan
5. Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan