1. The Enzootic Research Center, Equine Research Institute, Japan Racing Association, Tochigi, Japan (Niwa, Kinoshita, Muranaka, Ochi, Ueno, Oku, Hariu, Katayama)
2. Department of Domestic Animal Internal Medicine, Clinical Veterinary Science, Veterinary Medicine, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan (Hobo)