1. Department of Pathology, The Affiliated Southeast Hospital of Xiamen University, Zhangzhou, Fujian 363000, P.R. China
2. Department of Gastrointestinal Surgery, Xiamen Humanity Hospital, Xiamen Fujian 361003, P.R. China
3. Endoscopy Center, Xiamen Cancer Hospital, The First Affiliated Hospital of Xiamen University, Xiamen Fujian 361003, P.R. China
4. Hepatopancreatobiliary Surgery, Xiamen Cancer Hospital, The First Affiliated Hospital of Xiamen University, Xiamen Fujian 361003, P.R. China
5. Cancer Research Center, Xiamen University Medical College, Xiamen, Fujian 361002, P.R. China
6. Biobank, Xiamen Cancer Hospital, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian 361003, P.R. China
7. Department of Gastrointestinal Surgery, Xiamen Cancer Hospital, The First Affiliated Hospital of Xiamen University, Xiamen Fujian 361003, P.R. China