Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Huazhong University of Science and Technology - Department of Epidemiology and Biostatistics, Hubei Provincial Center for Disease Control and Prevention - Institute of Preventive Medicine Information, Hubei Provincial Center for Disease Control and Prevention - Institute of Preventive Medicine Information, Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Huazhong University of Science and Technology - Department of Occupational & Environmental Health, Huazhong University of Science and Technology - Department of Occupational and Environmental Health, Hubei Provincial Center for Disease Control and Prevention - Division of Human Resources, Science and Education, Huazhong University of Science and Technology - Department of Occupational and Environmental Health, Hubei Provincial Center for Disease Control and Prevention - Institute of Preventive Medicine Information and Huazhong University of Science and Technology - Department of Occupational and Environmental Health