1. Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
2. Department of Gastric and Pancreatic Surgery, Sun Yat-sen University Cancer Center, Guangzhou, China
3. Guangdong Laboratory Animal Monitoring Institute, Guangzhou, China
4. Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China