1. Department of Pathogenic Microbiology, Basic Medical College, Weifang Medical University, Weifang 261053, Shandong, P.R. China
2. Key Lab for Immunology in Universities of Shandong Province, Basic Medical College, Weifang Medical University, Weifang 261053, Shandong, P.R. China
3. Department of Gynecology, Weifang Medical University Affiliated Hospital, Weifang 261000, Shandong, P.R. China
4. Laboratory of Morphology, Weifang Medical University, Weifang 261053, Shandong, P.R. China
5. Clinical Medical College, Weifang Medical University, Weifang 261053, Shandong, P.R. China