Yijiu Ren1, Huikang Xie2, Chenyang Dai1, Chang Chen3. 1. Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China. 2. Department of Pathology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China. 3. Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China. chenthoracic@163.com.