1. State Key Laboratory of Molecular Oncology, Department of Etiology and Carcinogenesis, Cancer Hospital and Institute, Peking Union Medical College, and Chinese Academy of Medical Sciences, Beijing, P.R. China.
2. Department of Endoscopy, Cancer Hospital and Institute, Peking Union Medical College, and Chinese Academy of Medical Sciences, Beijing, P.R. China.
3. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Thoracic Surgery, Peking University School of Oncology, Beijing Cancer Hospital & Institute, Beijing, P.R. China.
4. Department of Thoracic Surgery, Cancer Hospital and Institute, Peking Union Medical College, and Chinese Academy of Medical Sciences, Beijing, P.R. China.