1. Department of Occupational Safety and Health, College of Public Health, China Medical University, Taichung 406040, Taiwan
2. Department of Occupational Health Practice and Management, Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Kitakyushu 807-8555, Japan
3. International Master Program for Public Health, College of Public Health, China Medical University, Taichung 406040, Taiwan