1. Department of Gastrointestinal Surgery, Xiangya Hospital, Central South University, Changsha, China
2. Department of Oncology, Xiangya Hospital, Central South University, Changsha, China
3. Department of General Surgery, Xiangya Hospital, Central South University, Changsha, China
4. Institute of Medical Sciences, Xiangya Hospital, Central South University, Changsha, China
5. Department of Pathology, Xiangya Hospital, Central South University, Changsha, China