1. College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
2. Experimental and Research Animal Institute, Sichuan University, Chengdu 610065, P. R. China
3. Western Theater Command Air Force Hospital, Department of Oncology Hematology, No. 137 Jiuyanqiao Shunjiang Road, Chengdu, Sichuan Province, 610021, P. R. China