1. Laboratory of Veterinary Pathology, Azabu University, Sagamihara, Kanagawa
2. Research Institute of Biosciences, Azabu University, Sagamihara, Kanagawa
3. Laboratory of Environmental Pathology, Azabu University, Sagamihara, Kanagawa
4. Laboratory of Veterinary Clinical Pathology, Graduate School of Agricultural and Life Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan