1. Department of Ophthalmology; Chang Gung Memorial Hospital; Chiayi Taiwan
2. College of Medicine; Chang Gung University; Taoyuan Taiwan
3. Department of Nursing; Chang Gung University of Science and Technology; Chiayi Taiwan
4. School of Traditional Chinese Medicine, College of Medicine; Chang Gung University; Taoyuan Taiwan
5. Department of Traditional Chinese Medicine; Chang Gung Memorial Hospital; Chiayi Taiwan
6. Health Information and Epidemiology Laboratory of Chang Gung Memorial Hospital; Chiayi Taiwan
7. Institute of Occupational Medicine and Industrial Hygiene; National Taiwan University College of Public Health; Taipei Taiwan
8. Department of Environmental and Occupational Medicine, National Taiwan University College of Medicine; National Taiwan University Hospital; Taipei Taiwan