1 Department of Colorectal Tumor Surgery, Beijing Shijitan Hospital Affiliated to Capital Medical University, Tieyi Road, Haidian Distinct, Beijing, 100038, China. liqiang2169@163.com.
2 Department of Colorectal Tumor Surgery, Beijing Shijitan Hospital Affiliated to Capital Medical University, Tieyi Road, Haidian Distinct, Beijing, 100038, China.