1. Laboratory of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
2. Japan Animal Referral Medical Center, 2-5-8, Kuji, Takatsu, Kawasaki-shi, Kanagawa 213-0023, Japan
3. Minato Ohori Animal Hospital, 2-9-29, Ohtemon, Chuo-ku, Fukuoka-shi, Fukuoka 810-0074, Japan