1. School of Public Health, North China University of Science and Technology, Tangshan, China.
2. Department of Laboratory Medicine, North China University of Science and Technology, The Fifth Hospital of Shijiazhuang, Shijiazhuang, China.
3. State Key Laboratory of Pathogen and Biosecurity, Department of AIDS Research, Beijing Institute of Microbiology and Epidemiology, Beijing, China.
4. Clinical Laboratory, The Second Hospital of Xingtai, Xingtai, China.
5. Clinical Laboratory, Zhangjiakou Infectious Disease Hospital, Zhangjiakou, China.