1. Department of Radiation Oncology, Chi Mei Medical Center, Liouying, Tainan, Taiwan
2. Department of Medical Research, Chi Mei Medical Center, Tainan, Taiwan
3. Department of Hospital and Health Care Administration, Chia Nan University of Pharmacy and Science, Tainan, Taiwan
4. Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
5. Department of Occupational and Environmental Medicine, National Cheng Kung University Hospital, Tainan, Taiwan
6. Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Hsin-Chu, Taiwan
7. Graduate Institute of Medical Sciences, Chang Jung Christian University, Tainan, Taiwan