1. Department of Thoracic Surgery, Anhui Provincial Cancer Hospital (The First Affiliated Hospital of University of Science and Technology of China West District), Hefei, Anhui 230000, P.R. China
2. Department of Orthopaedics, The First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
3. Department of Oncology, Hunan Provincial People's Hospital (The First Affiliated Hospital of Hunan Normal University), Changsha, Hunan 410002, P.R. China