1. Department of Occupational and Environmental Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China;
2. Department of Prevention and Control for Occupational Disease, Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, Jiangsu, China;
3. Kunshan Municipal Center for Disease Prevention and Control, Suzhou, Jiangsu, China;
4. Nanjing Prevention and Treatment Center for Occupational Diseases, Nanjing, Jiangsu, China;
5. Suzhou Municipal Center for Disease Prevention and Control, Suzhou, Jiangsu, China