Department of Occupational Health and Occupational Diseases;
College of Public Health;
Zhengzhou University;
Zhengzhou 450001;
Henan;
China;
Department of Zhengzhou Institute of Occupational Health;
Zhengzhou 450053;
Henan;
China;
Department of Epidemiology and Biostatistics;
College of Public Health;
Zhengzhou University;
Zhengzhou 450001;
Henan;
China;
The Key Laboratory of Nano medicine and Health Inspection of Zhengzhou;
Zhengzhou 450001;
Henan;
China;