1. School of Community and Environmental Health, College of Health Sciences, Old Dominion University, Norfolk, VA, USA
2. Department of Mathematics and Statistics, College of Sciences, Old Dominion University, Norfolk, VA, USA
3. Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung City, Taiwan
4. Institute of Labor, Occupational Safety and Health, Ministry of Labor, New Taipei City, Taiwan
5. School of Public Health, National Defense Medical Center, Taipei, Taiwan