1. Department of Environmental and Occupational Health, Guangxi Medical University, Nanning, China
2. Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, China
3. Guangxi Center for Disease Prevention and Control, Nanning, Guangxi, China
4. The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
5. Department of Environmental Health and Occupational Medicine, School of Public Health, Guilin Medical University, Guilin, Guangxi, China