1. Technical Institute of Physics and ChemistryChinese Academy of Sciences Beijing 100190 China
2. Stomatology DepartmentGeneral Hospital of Chinese People's Liberation Army 28 FuXing Road Beijing 100853 China
3. Institute of Biomedicine and Biotechnology Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen 518055 China
4. Department of PhysicsDepartment of Materials Science and Engineering, and Department of Biomedical EngineeringCity University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China