1. Laboratory of Internal Medicine, Department of Veterinary Clinical Sciences, (Yamato, Kasai, Shiota, Yamasaki, Maede), and Veterinary Teaching Hospital (Tajima), Graduate School of Veterinary Medicine, Hokkaido University, Kita-ku, Sapporo 060-0818, Japan;
2. Katsura Animal Hospital (Katsura, Takahashi), Nishi-ku, Sapporo 063-0866, Japan
3. From the