1. Doctor of Public Health (International Program), Faculty of Public Health, Mahidol University, Bangkok 10400, Thailand
2. Division of Clinical Nutrition, Department of Internal Medicine, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
3. Research and Development Office, Thailand Institute of Occupational Safety and Health, Ministry of Labor, Bangkok 10170, Thailand
4. Department of Nutrition, Faculty of Public Health, Mahidol University, Bangkok 10400, Thailand