1. Department of Pulmonary Medicine, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China
2. Cancer Stem Cells Research Group, Shanghai Jiaotong University Cancer Institute, Shanghai 200032, China
3. Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
4. Department of Pathology and Genomic Medicine, Houston Methodist Hospital Research Institute, Houston, Texas 77030, USA