1. Department of Environmental Measurement and Control University of Occupational and Environmental Health Kitakyushu Japan
2. Department of Social Medicine Saga University Saga Japan
3. Department of Occupational and Community Health Nursing University of Occupational and Environmental Health Kitakyushu Japan
4. Osaka Occupational Health Service Center Japan Industrial Safety and Health Association Tokyo Japan
5. Japan High Soft Corporation Tokyo Japan
6. Riken Keiki Co. Ltd Tokyo Japan