1. Department of Occupational Health and Safety Faculty of Public Health Mahidol University Bangkok Thailand
2. School of Occupational Health and Safety Institute of Public Health Suranaree University of Technology Nakhon Ratchasima Thailand
3. Department of Industrial Arts Faculty of Industrial Technology Lampang Rajabhat University Lampang Thailand
4. Department of Occupational Safety and Health Management School of Health Sciences University of Occupational and Environmental Health, Japan Kitakyushu Japan
5. Department of Environmental Epidemiology Institute of Industrial Ecological Sciences University of Occupational and Environmental Health, Japan Kitakyushu Japan