1. Department of Radiation Oncology, Renmin Hospital of Wuhan University, Wuhan, China;
2. Department of Gastrointestinal Surgery, The Central Hospital of Wuhan Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China;
3. Department of Oncology, The Central Hospital of Enshi Autonomous Prefecture, Enshi, China;
4. Enshi Clinical College of Wuhan University, Enshi, China