1. Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, 420/1 Rajvithee Rd., Rachathewee, Bangkok 10400, Thailand
2. Occupational Health Training Center, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, Fukuoka 807-8555, Japan
3. Bureau of International Health Cooperation, National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
4. College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4811, Australia