1. Department of School of Biomedical Engineering; Capital Medical University; Beijing China
2. Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application; Capital Medical University; Beijing China
3. Department of Radiology, Beijing Youan Hospital; Capital Medical University; Beijing China
4. Department of Spinal Surgery; Tianjin Hospital; Tianjin China
5. Orthopaedic Private Practice; Fresno California USA
6. Department of Orthopaedics, Beijing Luhe Hospital; Capital Medical University; Beijing China