W Ruoming1, Y Zhen2, Z Tengteng3, H Jisheng4. 1. General Surgery of First Renmin Hospital of Shangqiu, Zhengzhou, China. 2. Gastrointestinal Surgery of First Affiliated Hospital of Zhengzhou University, Zhengzhou, China. 3. Cancer Department of First Renmin Hospital of Shangqiu, Zhengzhou, China. 4. General Surgery of First Renmin Hospital of Shangqiu, Zhengzhou, China. huangjishengrm@163.com.