1. Pathology and Pathophysiology Research Division, National Institute of Animal Health, Tsukuba, Ibaraki 305–0856, Japan
2. Chubushiryo Co., Ltd., Chita, Aichi 478–8502, Japan
3. Laboratory of Veterinary Internal Medicine, Azabu University, Sagamihara, Kanagawa 252–5201, Japan
4. Value Farm Consulting Ltd., Ushiku, Ibaraki 300–1260, Japan