1. Department of Occupational and Environmental Medicine, College of Medicine, National Cheng Kung University Hospital, National Cheng Kung University, Tainan, Taiwan
2. Occupational Medicine, Cambridge Health Alliance, Harvard Medical School, Harvard University, Cambridge MA, USA
3. Department of Tourism, Food, and Beverage Management, Chang Jung Christian University, Tainan, Taiwan
4. Department of Occupational Medicine, Chi-Mei Medical Center, Tainan, Taiwan
5. Department of Occupational and Environmental Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan
6. Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
7. Occupational Safety, Health, and Medicine Research Centre, National Cheng Kung University, Tainan, Taiwan