1. Nagaragawa Research Center, API Co., Ltd., 692-3 Nagara, Gifu-shi, Gifu 502-0071, Japan
2. Laboratory of Veterinary Pathology, Department of Veterinary Medicine, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1193, Japan
3. Division of Animal Experiment, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu 501-1194, Japan