1. School of Community and Environmental Health, College of Health Sciences, Old Dominion University, Norfolk, VA
2. Department of Mathematics and Statistics, College of Sciences
3. Institute of Labor, Occupational Safety and Health, Ministry of Labor, New Taipei City, Taiwan
4. School of Public Health, National Defense Medical Center, Taipei, Taiwan
5. Department of Occupational Safety and Health, Chung Shan Medical University, Taichung, Taiwan
6. Center for Environmental Toxin and Emerging Contaminant Research, Chung Shan University, Taichung, Taiwan
7. Department of Occupational Medicine, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan