1. School of Public Health and Health Management, Gannan Medical University, Ganzhou, China.
2. State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing, China.
3. Hebei Key Laboratory of Immune Mechanism of Major Infectious Diseases and New Technology of Diagnosis and Treatment, The Fifth Hospital of Shijiazhuang, Shijiazhuang, China.
4. School of Public Health, North China University of Science and Technology, Tangshan, China.