1. Huaxi MR Research Center (HMRRC)Functional and Molecular Imaging Key Laboratory of Sichuan ProvinceDepartment of RadiologyNational Clinical Research Center for GeriatricsState Key Laboratory of BiotherapyWest China Hospitaland National Engineering Research Center for BiomaterialsSichuan University Chengdu 610041 China
2. West China School of Medicineand West China College of StomatologySichuan University Chengdu 610041 China
3. Amgen Bioprocessing CentreKeck Graduate Institute CA 91711 USA