1. Department of Microbiology, National Institute of Health Sciences, Kanagawa, Japan
2. Department of Hygiene Research, Mie Prefecture Health and Environment Research Institute, Japan
3. Section of Trace-level Analysis, Japan Food Research Laboratories, Tokyo, Japan
4. Food Department, Nagoya City Public Health Research Institute, Nagoya, Japan
5. Chemistry Division, Kanagawa Prefectural Institute of Public Health, Kanagawa, Japan
6. Physics and Chemistry Section, Kawasaki City Institute for Public Health, Kanagawa, Japan
7. Science and Chemical Section, Food Analysis Technology Center SUNATEC, Mie, Japan
8. Testing Section, Japan Food Inspection Corporation, Tokyo, Japan
9. Department of Food and Life Sciences, Azabu University, Kanagawa, Japan