1. Shaanxi Key Laboratory of biomedical metal materials
2. Northwest Institute for Non-ferrous Metal Research
3. Xi'an 710016
4. P R China
5. Academy for Advanced Interdisciplinary Studies
6. Peking University
7. Beijing
8. China
9. China–America Institute of Neuroscience
10. Xuanwu Hospital
11. Capital Medical University
12. Beijing 100053
13. Department of Materials Science and Engineering
14. College of Engineering
15. Beijing 100871