1. Digestive Diseases Center Guangdong Provincial Key Laboratory of Digestive Cancer Research The Seventh Affiliated Hospital of Sun Yat‐sen University Shenzhen Guangdong 518107 China
2. Department of Radiotherapy Affiliated Cancer Hospital of Zhengzhou University Henan Cancer Hospital Zhengzhou Henan 450000 China
3. Department of Medicine The University of Oklahoma Health Sciences Center Oklahoma City OK 73104 USA
4. Department of Gynecology and Obstetrics The Seventh Affiliated Hospital of Sun Yat‐sen University Shenzhen Guangdong 518107 China
5. Department of Gastrointestinal Surgery Sun Yat‐sen Memorial Hospital Sun Yat‐sen University Guangzhou Guangdong 510120 China
6. Department of Gastrointestinal Surgery The First Affiliated Hospital of Sun Yat‐sen University Guangzhou Guangdong 510062 China