1. Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences 5625 Renmin Street Changchun Jilin 130022 P. R. China
2. Laboratory of Vaccine and Antibody Engineering Beijing Institute of Biotechnology Fengtai Beijing 100071 P. R. China
3. School of Applied Chemistry and Engineering University of Science and Technology of China Hefei 230026 China