1. Department of Orthopaedic Surgery Tianjin Medical University General Hospital Tianjin China
2. Department of Orthopaedic Surgery The Affiliated People's Hospital of Shanxi Medical University Taiyuan China
3. Department of Geriatrics Tianjin Medical University General Hospital Tianjin China
4. Tianjin Neurological Institute Tianjin Medical University General Hospital Tianjin China
5. Tianjin Key Laboratory of Spine and Spinal Cord Tianjin Medical University General Hospital Tianjin China