1. Department for Traditional Chinese Medicine, Chang Gung Memorial Hospital, Chia-Yi 61363, Taiwan
2. Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei 10055, Taiwan
3. Department of Public Health, National Taiwan University College of Public Health, Taipei 10055, Taiwan
4. Department of Environmental and Occupational Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10055, Taiwan