Institution: | (1) Department of Environmental and Occupational Health, National Cheng Kung University Medical College, 138 Sheng Li Road, Tainan, Taiwan, TW;(2) Graduate Institute of Occupational Safety and Health, Kaohsiung Medical College, Kaohsiung, Taiwan, TW;(3) Department of Public Health, National Defense Medical College, Taipei, Taiwan, TW;(4) Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei, Taiwan, TW |