1. Department of Thoracic Surgery; The Second Xiangya Hospital of Central South University; 139 Renmin Middle Road Changsha Hunan 410011 P. R. China
2. Department of Laboratory Medicine and Pathology; Masonic Cancer Center; University of Minnesota; MMC 609, 420 Delaware St SE Minneapolis MN 55455 USA
3. Group of NanoMaterials; Cancer Research Institute; Central South University; 110 Xiangya Road Changsha Hunan 410078 P. R. China
4. Departments of Thoracic Surgery; The Third Xiangya Hospital of Central South University; 138 Tongzi Po Road Changsha Hunan 410013 P. R. China