Xing Wei1, Hongfan Yu2, Qiuling Shi3,4. 1. Department of Thoracic Surgery, Sichuan Cancer Hospital & Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China. 2. School of Public Health and Management, Chongqing Medical University, Chongqing, China. 3. School of Public Health and Management, Chongqing Medical University, Chongqing, China. qshi@cqmu.edu.cn. 4. Center for Cancer Prevention Research, Sichuan Cancer Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Chengdu, Sichuan, China. qshi@cqmu.edu.cn.