1. College of Environmental Science and Engineering, China West Normal University, Nanchong 637002, Sichuan, China
2. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China
3. Radiology of Department, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan, China
4. College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China
5. Institute for Advanced Study, Chengdu University, Chengdu 610106, Sichuan, China
6. Department of Radiology and Huaxi MR Research Center, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu 610041, Sichuan, China