1. National Foundation for the Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
3. Department of Pediatrics, Chung Shan Medical University, Taichung, Taiwan
4. National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan, Miaoli County, Taiwan
5. Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei, Taiwan
6. Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Miaoli County, Taiwan
7. Department of Public Health, National Defense Medical Center, Taipei, Taiwan
8. Department of Public Health, College of Public Health, China Medical University, Taichung, Taiwan