1. Department of Occupational Health and Safety, Faculty of Public Health, Mahidol University, Center of Excellence on Environmental Health and Toxicology, Commission on Higher Education, Ministry of Education, Bangkok, Thailand
2. Department of Epidemiology, Faculty of Public Health, Mahidol University, Bangkok, Thailand
3. Phitsanulok Provincial Public Health Office, Phitsanulok, Thailand
4. Department of Public Health, University of Massachusetts Lowell, Lowell, MA, USA