1. State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of Sciences Shanghai 200050 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. Department of Orthopaedic SurgeryDigital Medicine InstituteNanjing Medical University Nanjing Hospital. No. 68 Changle Road Nanjing 210006 P. R. China