1. Division of Public Health and Epidemiology Department of Social Medicine Asahikawa Medical University Asahikawa Japan
2. Department of Pediatrics Asahikawa Medical University Asahikawa Japan
3. Faculty of Nursing Japanese Red Cross Hokkaido College of Nursing Kitami Japan
4. Center for Environmental and Health Sciences Hokkaido University Sapporo Japan
5. Facutly of Health Sciences Hokkaido University Sapporo Japan
6. Department of Occupational and Environmental Health Nagoya City University Graduate School of Medical Sciences Nagoya Japan
7. National Institute for Environmental Studies Tsukuba Japan
8. National Center for Child Health and Development Tokyo Japan
9. Tohoku University Sendai Japan
10. Fukushima Medical University Fukushima Japan
11. Chiba University Chiba Japan
12. Yokohama City University Yokohama Japan
13. University of Yamanashi Chuo Japan
14. University of Toyama Toyama Japan
15. Kyoto University Kyoto Japan
16. Osaka University Suita Japan
17. Hyogo College of Medicine Nishinomiya Japan
18. Tottori University Yonago Japan
19. Kochi University Nankoku Japan
20. University of Occupational and Environmental Health Kitakyushu Japan
21. Kumamoto University Kumamoto Japan