1. Food Hygiene and Environmental Health, Graduate School of Life and Environmental Science, Kyoto Prefectural University, Kyoto, Kyoto, Japan
2. Department of Life Science and Medical BioScience, Waseda University School of Advanced Science and Engineering, Shinjuku-ku, Tokyo, Japan
3. Department of Microbiology and Immunology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
4. Department of Bacteriology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Niigata, Japan
5. Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, Japan
6. Department of Applied Pharmacology and Therapeutics, Osaka City University Graduate School of Medicine, Osaka, Osaka, Japan
7. Genome Information Research Center, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
8. Division of Public Health, Osaka Institute of Public Health, Osaka, Osaka, Japan