1. Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun 130021, Jilin, China
2. Shenzhen Prevention and Treatment Center for Occupational Diseases, 2019 Buxin Road, Shenzhen 518020, China
3. School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, 13 Hangkong Road, Wuhan 430030, China