1. Department of Occupational and Environmental Medicine, Graduate School of Medicine Chiba University Chiba Japan
2. Department of Hygiene Kanazawa Medical University Uchinada Japan
3. Department of Public Health Kanazawa Medical University Uchinada Japan
4. Department of Community Health Nursing Kanazawa University School of Health Sciences Kanazawa Japan
5. Medical Research Institute Kanazawa Medical University Uchinada Japan