1. Huaxi MR Research Center (HMRRC)Department of RadiologyFunctional and Molecular Imaging Key Laboratory of Sichuan ProvinceNational Clinical Research Center for GeriatricsState Key Laboratory of BiotherapyWest China HospitalSichuan University Chengdu 610041 China
2. West China School of MedicineSichuan University Chengdu 610041 China
3. Amgen Bioprocessing CentreKeck Graduate Institute Claremont CA 91711 USA
4. National Engineering Research Center for BiomaterialsSichuan University Chengdu 610064 China