1. International Research Center for Advanced Structural and Biomaterials School of Materials Science & Engineering Beihang University Beijing 100191 China
2. School of Materials Science and Engineering Peking University Beijing 100871 China
3. Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100083 China
4. Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100083 China
5. Beijing Jishuitan Hospital Beijing Research Institute of Orthopedics and Traumatology Beijing 100035 China
6. Department of Materials Science and Engineering University of California Berkeley CA 94720 USA