1. Occupational Stress and Health Management Research Group, National Institute of Occupational Safety and Health, Kanagawa, Japan
2. Unit of Public Health and Preventive Medicine, School of Medicine, Yokohama City University, Yokohama, Japan
3. Advanced Research Center for Human Sciences, Waseda University, Tokorozawa, Japan
4. Faculty of Human Sciences, Musashino University, Tokyo, Japan
5. Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Japan