1. Department of Hygiene, Yamaguchi University Graduate School of Medicine, Japan
2. Division of Health Administration and Promotion, Faculty of Medicine, Tottori University, Japan
3. Department of Environmental Medicine, Kurume University School of Medicine, Japan
4. Saiki Clinic, Japan
5. Department of Hygiene, School of Medicine, Wakayama Medical University, Japan
6. Department of Nursing, Nagoya University School of Health Sciences, Japan
7. Sapporo Workers Clinic, Japan
8. Kensei-Ishii Clinic, Japan