1. Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250021, P.R. China
2. Institute of Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250100, P.R. China
3. Key Laboratory of Chest Cancer, The Second Hospital of Shandong University, Jinan, Shandong 250021, P.R. China