1. Department of Radiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, PR China
2. Department of Radiology, TongJi Hospital, TongJi Medical College, HuaZhong University of Science & Technology, Wuhan, PR China
3. Department of Radiology, West China Hospital, Sichuan University, Chengdu, PR China
4. Mallinckrodt Institute of Radiology, Washington University School of Medicine in St Louis, St Louis, MO, USA