1. Beijing National Laboratory for Molecular Sciences Laboratory of Polymer Physics and Chemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Department of Cariology and Endodontology Peking University School and Hospital of Stomatology Beijing 100081 China
4. Department of Orthopaedics Beijing Friendship Hospital Capital Medical University Beijing 100050 China