1. Department of Thoracic Surgery, The Affiliated Changzhou No.�2 People's Hospital of Nanjing Medical University, Changzhou, Jiangsu 213003, P.R. China
2. Department of Thoracic Surgery, The Affiliated Changzhou No. 2 People's Hospital of Nanjing Medical University, Changzhou, Jiangsu 213003, P.R. China