Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, China. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China. Department of Radiation Oncology, Jiangsu Cancer Hospital, Jiangsu Institute Of Cancer Research, Affiliated Cancer Hospital of Nanjing Medical University, Nanjing, China. Department of Radiation Oncology, Gansu Province Cancer Hospital, Lanzhou, China. Department of Radiation Oncology, Fudan University Shanghai Cancer Center Minhang Branch Hospital, Shanghai, China. Department of Radiation Oncology, Jiangxi Province Cancer Hospital, Nanchang, China. Department of Radiation Oncology, Shanxi Province Cancer Hospital, Taiyuan, China. Department of Radiation Oncology, First Affiliated Hospital of Xiamen University, Xiamen, China. Department of Radiation Oncology, Huadong Hospital Affiliated to Fudan University, Shanghai, China. Department of Radiation Oncology, Affiliated Hospital of Jiangnan University, Wuxi, China. Department of Radiation Oncology, Hainan Province People's Hospital, Haikou, China. Department of Radiation Oncology, Fujian Province Cancer Hospital, Fuzhou, China. Department of Thoracic Surgery, Jiangsu Cancer Hospital, Jiangsu Institute Of Cancer Research, Affiliated Cancer Hospital of Nanjing Medical University, Nanjing, China. Department of Internal Medicine, Jiangsu Cancer Hospital, Jiangsu Institute Of Cancer Research, Affiliated Cancer Hospital of Nanjing Medical University, Nanjing, China. Department of Cancer Prevention & Clinical Statistics Center, Fudan University Shanghai Cancer Center, Shanghai, China. Shanghai General Hospital, Shanghai, China.