1. Department of Radiology, Second Xiangya Hospital, Central South University, Changsha, China.
2. Department of Pulmonary and Critical Care Medicine, Second Xiangya Hospital, Central South University, #139, Renmin Middle Rd, Changsha 410011, China.
3. Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.