1. Department of Pulmonary Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China
2. Department of Radiotherapy, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China
3. Center of Medical Experiment, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China