1. Spine Center, Department of Orthopaedics, Changzheng Hospital Naval Medical University (Second Military Medical University) Shanghai 200003 P. R. China
2. Department of Vascular and Endovascular Surgery, Changzheng Hospital Naval Medical University (Second Military Medical University) Shanghai 200003 P. R. China
3. State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China
4. Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen 361005 P. R. China
5. Department of Orthopaedics, Shanghai General Hospital Shanghai Jiao Tong University School of Medicine 85 Wujin Road Shanghai 200080 P. R. China