1. Department of Chest Surgery, Nanjing Chest Hospital, Nanjing, Jiangsu 210029, P.R. China
2. Department of Oncology, Xuzhou Central Hospital, Xuzhou, Jiangsu 221000, P.R. China
3. Department of Thoracic Surgery, Jiangsu Province Hospital, Nanjing, Jiangsu 210029, P.R. China