1 Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Dongcheng District, Beijing, China; School of Medicine, Tsinghua Medicine, Tsinghua University, Beijing, China.
2 Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Dongcheng District, Beijing, China.
3 Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, United States.
4 Department of Surgery, University of California San Francisco, San Francisco, CA, United States.
5 Department of Anesthesiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Dongcheng District, Beijing, China.
6 Department of Orthopedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Dongcheng District, Beijing, China.
7 Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Dongcheng District, Beijing, China. Electronic address: linchen0818@sina.com.