1 Department of Colorectal Surgery, National Cancer Center / National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China.
2 Breast Disease Center, Peking University First Hospital, Beijing, 100034, China.
3 Department of Colorectal Surgery, National Cancer Center / National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China. fcwpumch@163.com.