1. Key Laboratory of Biomedical Polymers (Ministry of Education)
2. College of Chemistry and Molecular Sciences
3. Wuhan University
4. Wuhan 430072
5. China
6. Department of Biology and Chemistry
7. City University of Hong Kong
8. Kowloon
9. Department of Chemistry
10. Youngstown State University
11. One University Plaza
12. Youngstown
13. USA