1. Laboratory of Farm Animal Medicine, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan
2. Laboratory of OSG Veterinary Science for Global Disease Management, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
3. Veterinary Teaching Hospital, Iwate University, Iwate, Japan
4. Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan