1. Department of Orthopedics, China-Japan Union Hospital of Jilin University, 126 Xiantai Street, Changchun 130033, P. R. China
2. Knee Surgery Department of the Institute of Sports Medicine, Peking University Third Hospital, 49 Huayuanbei Road, Beijing 100191, P. R. China
3. Mork Family Department of Chemical Engineering & Materials Science, University of Southern California, 925 West 34th Street, Los Angeles, California 90089, United States of America
4. Key Laboratory
of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
5. Jilin Biomedical Polymers Engineering Laboratory, 5625 Renmin Street, Changchun 130022, P. R. China