Peking University, Peking University, University of Shanghai for Science and Technology - School of Environment and Architecture, Shanxi Medical University, Xi'an Jiaotong University (XJTU) - School of Public Health, Central China Normal University, Institute of Occupational Medicine, University of Edinburgh, Institute of Occupational Medicine, Peking University, affiliation not provided to SSRN, Xi'an Jiaotong University (XJTU) - Department of Occupational and Environmental Health, Peking University and Peking University