1. The Institute of Basic Medical Sciences, National Cheng Kung University Medical College, Tainan, Taiwan
2. Department of Health Business Administration, Hung-Kuang University, Taichung, Taiwan
3. Department of Environmental and Occupational Health, National Cheng Kung University Medical College, Tainan, Taiwan
4. Department of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei, Taiwan
5. Department of Physiology, National Cheng Kung University Medical College, Tainan, Taiwan
6. Department of Environmental and Occupational Medicine, National Taiwan University (NTU) and NTU Hospital, Taipei, Taiwan