1. Research Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu 210002, P.R. China
2. Department of Radiation Oncology, Qianfoshan Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China
3. Department of Thoracic Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China