1 Department of Gastrointestinal Surgery, Peking University Shougang Hospital, Beijing, China.
2 Department of Radiology, Peking University Shougang Hospital, Beijing, China.
3 Department of Oncology, Peking University Shougang Hospital, Beijing, China.
4 Department of Oncology, Peking University Shougang Hospital, Beijing, China; Gastrointestinal Cancer Center, Peking University Cancer Hospital, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Beijing 100142, China; Peking-Tsinghua Center for Life Science, Peking University International Cancer Center, Beijing, China. Electronic address: zlgujin@126.com.