1. Department of Immunology, Hebei Medical University, Shijiazhuang, Hebei, PR China
2. Department of Microbiology and Immunology, Xingtai Medical College, Xingtai, Hebei, PR China
3. Basic Medical College, Hebei Medical University, Hebei, China
4. Key Laboratory of Immune Mechanism and Intervention on Serious Disease in Hebei Province, Hebei, China