1. Department of Public Health, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science, Okayama, Japan;
2. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan;
3. Center for Environmental Health Sciences, Integrated Health Risk Assessment Section, Tsukuba, Japan;
4. Third Department of Internal Medicine School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan;
5. Department of Life Science, Faculty of Science, Laboratory of Food Preventive Medicine, Okayama University of Science, Okayama, Japan;
6. Department of Patho-Physiology, Division of Periodontal Science, Okayama University Graduate School of Medicine, Okayama, Japan;
7. Department of Anatomy, Biology and Medicine, Division of Morphological Analysis, Faculty of Medicine, Oita University, Oita, Japan