1 Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; Department of Anesthesia, China-Japan Union Hospital of Jilin University, Changchun 130033, PR China.
2 Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
3 Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China; Department of Spine Surgery, The First Hospital of Jilin University, Changchun 130021, PR China.
4 Department of Anesthesia, China-Japan Union Hospital of Jilin University, Changchun 130033, PR China.
5 Department of Biomedical Engineering, Yale University, New Haven, CT 06520, USA.
6 Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China. Electronic address: jxding@ciac.ac.cn.