1. Department of Radiology, State Key Laboratory of Biotherapy and Huaxi MR Research Center (HMRRC), West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
2. Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3. Department of Biotherapy, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
4. Key Laboratory of Drug Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, West China School of Pharmacy, Sichuan University, Chengdu 610041, China