1. Department of Radiology, The Third Affiliated Hospital of Chongqing Medical University, Chongqing 401120, P.R. China
2. Department of Radiology, Chinese PLA General Hospital, Beijing 100853, P.R. China
3. Department of Radiology, The Traditional Chinese Medicine Hospital of Changshou District, Chongqing 401220, P.R. China
4. Department of Respiratory Diseases, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, P.R. China
5. Department of Pathology, Chinese PLA General Hospital, Beijing 100853, P.R. China
6. Department of Radiology, The Third Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China