1. Graduate School of Human Life Science, Osaka City University, Osaka, Japan
2. Division of Microbiology, Osaka Institute of Public Health, Osaka, Japan
3. School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
4. Department of International Health, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan
5. Division of Microbiology, National Institutes of Health Sciences, Kawasaki, Japan