1. Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, Bangkok, Thailand
2. Health Science Programs, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand
3. Department of Medical Humanities, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
4. School of Health Science, Sukhothai Thammathirat Open University, Nonthaburi, Thailand