1. Department of Thoracic Surgery, The Sixth People's Hospital of Nantong, Nantong, Jiangsu 226000, P.R. China
2. Department of Pathology, The Sixth People's Hospital of Nantong, Nantong, Jiangsu 226000, P.R. China
3. Qingdao Medical College, Qingdao University, Qingdao, Shandong 266000, P.R. China