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. Sawanpracharak Hospital, Nakhon Sawan, Thailand
4. Paholpolpayuhasena Hospital, Kanchanaburi, Thailand
5. Amnatcharoen Hospital, Amnartcharoen, Thailand
6. Department of Work Environment, University of Massachusetts Lowell, Lowell, Massachusetts, USA