1. Department of Occupational and Environmental Health, School of Public Health, Guangxi Medical University, Nanning, China
2. Guangxi Colleges and Universities Key Laboratory of Prevention and Control of Highly Prevalent Diseases, Guangxi Medical University, Nanning, China
3. Insitute of Vaccine Clinical Research, Guangxi Center for Disease Prevention and Control, Nanning, China
4. Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, China
5. Guilin Medical University, Guilin, China