1. Department of Spine Surgery, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, P.R. China
2. Department of Molecular Orthopaedics, Beijing Research Institute of Traumatology and Orthopaedics, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, P.R. China
3. Department of Orthopaedics, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, P.R. China
4. Department of Rheumatology and Immunology, Beijing Jishuitan Hospital, Capital Medical University, Beijing 100035, P.R. China