1. Osaka Institute of Public Health, Osaka, Japan
2. Shijonawate Public Health Center, Osaka Prefectural Government, Osaka, Japan
3. Osaka Prefectural Central Market Food Sanitation Inspection Laboratory, Osaka, Japan
4. Tondabayashi Public Health Center, Osaka Prefectural Government, Osaka, Japan
5. Research Center for Microorganism Control, Osaka Prefecture University, Osaka, Japan