1. Institute of Oncology, Shandong Provincial Hospital, Shandong University, Jinan, Shandong 250021, P.R. China
2. Department of Radiology, The Third Affiliated Hospital of Shandong First Medical University (The Fourth People's Hospital of Jinan), Jinan, Shandong 250031, P.R. China
3. Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China