1. Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Miaoli, Taiwan,
2. Department of Public Health, National Defense Medical Center, Taipei, Taiwan,
3. Institute of Environmental Health, College of Public Health, China Medical University and Hospital, Taichung, Taiwan,
4. Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, WA, USA,
5. Department of Chemistry, Fu Jen Catholic University, Taipei, Taiwan, and
6. Institute of Occupational Safety and Health, Council of Labor Affairs, Taipei, Taiwan