[1] Department of Public Health, National Taiwan University, Taipei, Taiwan
[2] Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei, Taiwan
[3] Department of Environmental Engineering and Health, Yuanpei University, Hsinchu, Taiwan
[4] Industrial Technology Research Institute, Hsinchu, Taiwan
[5] National Taiwan University, No.17, Xu-Zhou Rd., Taipei 100, Taiwan