1. Division of Biomedical Food Research, National Institute of Health Science, Tokyo 158-8501, Japan
2. Center for Global Initiatives, Osaka University, Suita, Osaka 565-0871, Japan
3. Department of Bacteriology, Osaka Institute of Public Health, Higashinari, Osaka 537-0025, Japan
4. Research Center for Microbial Control, Osaka Prefecture University, Osaka 565-8531, Japan
5. Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan