1. Laboratory of Comparative Pathology, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
2. Wildlife Rescue Veterinarian Association of Japan, 302 Fuji Park BLDG., 1-23-16 Fujimi, Tachikawa 190-0013, Japan
3. Brain Science Institute, the Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan