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. Agricultural Biotechnology Research Center, Academia Sinica, Taipei 115, Taiwan
4. Oxidative Stress Group, Department of Molecular Biosciences, University of South Florida, Tampa, Florida 33620, United States
5. Department of Occupational Medicine, Chung Shan Medical University Hospital, Taichung 402, Taiwan