1. Department of Gastrointestinal Surgery Central Hospital of Shaoyang Shaoyang China
2. Department of Colorectal Surgery and Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases The Sixth Affiliated Hospital, Sun Yat‐sen University Guangzhou China
3. Department of Pathology Central Hospital of Shaoyang Shaoyang China
4. Department of Medical Oncology Central Hospital of Shaoyang Shaoyang China
5. Department of Pharmacy The Third Affiliated Hospital of Zhengzhou University Zhengzhou, Henan China
6. University Clinic Mannheim Medical Faculty Mannheim, University of Heidelberg Mannheim Germany