1. National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, P. R. China
2. College of Biomedical Engineering, Sichuan University, Chengdu 610064, P. R. China
3. Medical School, Kunming University of Science and Technology, Kunming 650500, P. R. China
4. Department of Nuclear Medicine and Clinical Nuclear Medicine Research Lab, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, China