1. Department of Orthopaedics The Affiliated Hospital of Xuzhou Medical University Xuzhou Jiangsu Province 221006 China
2. Department of Orthopaedics The First Affiliated Hospital of Soochow University Suzhou Jiangsu Province 215006 China
3. Department of Orthopaedics Shanghai General Hospital Shanghai Jiao Tong University School of Medicine 85 Wujin Road Shanghai 200080 P. R. China
4. Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases Shanghai Institute of Traumatology and Orthopaedics Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200025 P. R. China