1. Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, University of South China, Hengyang 421001, China
2. Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiang Ya School of Public Health, Central South University, Changsha 410078, China
3. School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001, China
4. Institute of Pathogenic Biology, School of Nursing, Hengyang Medical College, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, University of South China, Hengyang 421001, China