1. Huaxi MR Research Center (HMRRC), Department of Radiology, Functional and Molecular Imaging Key Laboratory of Sichuan Province, West China Hospital, Sichuan University, Chengdu 610041, China
2. Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325000, China
3. Department of Radiology, School of Medicine, Stanford University, Stanford, CA 94305, USA