1. Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
2. Department of Occupational Health, School of Public Health, Jining Medical University, Jining 272000, China
3. Key Lab of Environmental Hazard and Health of Shanxi Province, Shanxi Medical University, Taiyuan 030001, China
4. Key Lab of Cellular Physiology of Education Ministry, Shanxi Medical University, Taiyuan 030001, China
5. Sixth Hospital of Shanxi Medical University (General hospital of Tisco), Taiyuan 030001, China
6. Department of Occupational Health, School of Public Health, Xuzhou Medical University, Xuzhou 221000, China