1. Department of CT Diagnosis, The Second Affiliated Hospital of Qiqihar Medical College, Qiqihar, Heilongjiang 161006, P.R. China
2. Department of Radiology, Chinese PLA General Hospital, Beijing 100038, P.R. China
3. Department of Pathology, Chinese PLA General Hospital, Beijing 100038, P.R. China
4. Department of Respiratory Disease, School of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261053, P.R. China
5. Department of Thoracic Surgery, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, P.R. China
6. Department of Respiratory Disease, Beijing Shijitan Hospital, Capital Medical University, Beijing 100038, P.R. China