1. State Key Laboratory of Tribology
2. Department of Mechanical Engineering
3. Tsinghua University
4. Beijing 100084
5. China
6. Key Lab of Organic Optoelectronics and Molecular Engineering
7. Department of Chemistry
8. Department of International Medical Services
9. Peking Union Medical College Hospital
10. Chinese Academy of Medical Sciences
11. Beijing 100730
12. Medical Science Research Center
13. Department of Orthopaedic Surgery