1. Institute of Orthopedics and Department of Orthopedics
2. The First Affiliated Hospital
3. Soochow University
4. Suzhou 215006
5. P. R. China
6. School of Public Health
7. Medical College
8. Department of Spine Surgery
9. Tianjin Hospital
10. Tianjin University
11. Tianjin 300211
12. Department of Orthopedics
13. PLA General Hospital
14. Beijing 100853
15. Second People's Hospital of Changzhou
16. Nanjing Medical University
17. Changzhou 213003
18. Institute of Orthopedics