1. Department of Medical Imaging; Renji Hospital, Medical School of Jiaotong University, No. 160, Pujian Road, Pudong District; Shanghai 200127 P. R. China
2. Department of Medical Imaging; Tongji Hospital, Medical School of Tongji University, No. 389, Xincun Road, Putuo District; Shanghai 200065 P. R. China
3. Department of Blood Transfusion; Huashan Hospital, Fudan University, No. 12, Urumqi Road, Jing'an District; Shanghai 200040 P. R. China
4. Department of Anesthesiology; Tongji Hospital, Medical School of Tongji University, No. 389, Xincun Road, Putuo District; Shanghai 200065 P. R. China
5. Department of Radiology; Henan Provincial People's Hospital, No. 7, Weiwu Road, Jinshui District; Zhengzhou 450003 P. R. China
6. Huaxi MR Research Center; Department of Radiology, West China Hospital of Sichuan University; Chengdu 610065 P. R. China