1. Department of Thoracic Surgery, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R.�China
2. Department of Clinical Medicine, Nantong University Xinglin College, Nantong, Jiangsu 226001, P.R.�China
3. Department of Respiratory Medicine, The Second Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R.�China
4. Department of Thoracic Surgery, Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China