1. Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, Center of Excellence on Environmental Health and Toxicology, Bangkok, Thailand;
2. Department of Epidemiology, Faculty of Public Health, Mahidol University, Bangkok, Thailand;
3. Faculty of Public Health, Mahasarakham University, Mahasarakham, Thailand;
4. Department of Public Health, Zuckerberg College of Health Sciences, University of Massachusetts Lowell, Lowell, MA, USA