1. Laboratory of Stem Cell Biology, and Huaxi MR Research Center (HMRRC), Department of Radiology, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu 610041, China
2. Research Unit of Psychoradiology, Chinese Academy of Medical Sciences, and Functional and molecular imaging Key Laboratory of Sichuan Province, Chengdu, 610041, China
3. Amgen Bioprocessing Centre, Keck Graduate Institute, Claremont, CA 91711, USA