1. State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China
2. College of Life Sciences, Southwest Forestry University, Kunming, Yunnan, China
3. School of Public Health, Mudanjiang Medical University, Mudanjiang, Heilongjiang, China
4. School of Public Health, Anhui Medical University, Hefei, Anhui, China