Affiliation: | (1) Laboratory of Experimental Animal Science, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan, JP;(2) Institute for Animal Experimentation, School of Medicine, Hokkaido University, Sapporo, Japan, JP;(3) Laboratory of Microbiology, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan, JP |