1. Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China
2. School of Applied Chemistry and Engineering University of Science and Technology of China 96 Jinzhai Road Hefei 230026 P. R. China
3. Department of Orthopedics The Fourth Affiliated Hospital of China Medical University 4 Chongshan East Road Shenyang 110032 P. R. China
4. Department of Orthopedics The Second Hospital of Jilin University 218 Ziqiang Street Changchun 130041 P. R. China
5. School of Life Sciences Jilin University 2699 Qianjin Street Changchun 130022 P. R. China
6. Jilin Biomedical Polymers Engineering Laboratory Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun 130022 P. R. China