1. Shikoku Veterinary Medical Center, 3308-5 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0701, Japan
2. Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
3. Shikoku Cytopathological Laboratory, 712-1 Rokujyo-cho, Takamatsu, Kagawa 761-0303, Japan
4. North Lab, Kita 8-35, 2 Hondoori, Shiroishi-ku, Sapporo, Hokkaido 003-0027, Japan