1 State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers, Department of Cancer Epidemiology, Peking University Cancer Hospital & Institute, Beijing, China.
2 State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers, Department of Cancer Epidemiology, Peking University Cancer Hospital & Institute, Beijing, China. Electronic address: wenqing_li@bjmu.edu.cn.