1. Department of Functional diagnosis, Central South University Xiangya School of Medicine Affiliated Haikou Hospital, Haikou, Hainan 570208, P.R. China
2. Department of Orthopedics, The First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014040, P.R. China
3. Department of Immunology, Basic and Forensic Medicine of Baotou Medical College, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014040, P.R. China