1. Department of Health Inspection and Quarantine, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, People's Republic of China
2. Hunan Key Laboratory of Typical Environment Pollution and Health Hazards, University of South China, Hengyang 421001, People's Republic of China
3. Hengyang Center for Disease Control and Prevention, Hengyang, Hunan, 421001, People's Republic of China