1. Department of Public Health, Chung Shan Medical University, Taichung 402, Taiwan
2. Department of Occupational Safety and Health, Chung Shan Medical University, Taichung 402, Taiwan
3. Oxidative Stress Group, Department of Environmental Health Sciences, Florida International University, Miami, Florida 33199, United States
4. Biomolecular Sciences Institute, Florida International University, Miami, Florida 33199, United States
5. Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan