1. Department of Microbiology and Immunology, Nippon Medical School, Tokyo, Japan
2. Graduate School of Veterinary Science, Osaka Metropolitan University, Osaka, Japan
3. Osaka International Research Center for Infectious Diseases, Osaka Metropolitan University, Osaka, Japan
4. Department of Molecular Life Science, Tokai University School of Medicine, Kanagawa, Japan
5. Department of Medicine, Nippon Medical School, Tokyo, Japan
6. Department of Biochemistry and Molecular Biology, Nippon Medical School, Tokyo, Japan