1. Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, PR China
2. Department of Radiology, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Science, Peking Union Medical College, Beijing, PR China
3. Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
4. Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, PR China