1 Department of Family Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, Taiwan.
2 Institute of Environmental and Occupational Health Science, National Taiwan University College of Public Health, Taipei, Taiwan.
3 Institute of Environmental and Occupational Health Science, National Taiwan University College of Public Health, Taipei, Taiwan hyang@ntu.edu.tw.
4 Department of Public Health and Institute of Environmental and Occupational Health Science, National Taiwan University College of Public Health, Taipei, Taiwan.
5 Department of Environmental and Occupational Medicine, National Taiwan University Hospital, Taipei, Taiwan.