1. Department of Orthopedic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
2. Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China
3. Department of Microbiology and Immunology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450001, P.R. China