1. Department of Medical Oncology
2. Affiliated Cancer Hospital of Zhengzhou University
3. Zhengzhou 450008
4. P. R. China
5. State Key Laboratory of Polymer Physics and Chemistry
6. Changchun Institute of Applied Chemistry
7. Chinese Academy of Sciences
8. Changchun 130022
9. School of Chemical and Biomedical Engineering
10. Nanyang Technological University
11. Singapore 637457
12. Singapore