1. Hubei Provincial Hospital of Integrated Chinese and Western Medicine (Hubei Provincial Hospital of Occupational Diseases), Wuhan, China
2. National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing, China
3. Department of Environmental Hygiene and Occupational Medicine, School of Public Health, Medical College, Wuhan University of Science and Technology, Wuhan, China
4. Liaoning Provincial Health Service Center, Shenyang, China
5. Chongqing Center for Disease Control and Prevention, Chongqing, China
6. Guizhou Prevention and Treatment Institute for Occupational Disease, Guiyang, China
7. Beijing Center for Disease Control and Prevention, Beijing, China
8. Tianjin Center for Disease Control and Prevention, Tianjin, China
9. Shaanxi Provincial Center for Disease Control and Prevention, Xian, China
10. Ningxia Provincial Center for Disease Control and Prevention, Yinchuan, China