1. Center of Experimental Teaching for Public Health, School of Public Health and Management Chongqing Medical University Chongqing China
2. Center for Disease Control and Prevention of Bishan District Chongqing China
3. Institute of Life Sciences Chongqing Medical University Chongqing China
4. Department of Occupational and Environmental health, School of Public Health and Management Chongqing Medical University Chongqing China
5. Department of Health Laboratory Technology School of Public Health and Management, Chongqing Medical University Chongqing China