1. Department of Gastroenterology, First Hospital of Qinhuangdao, Qinhuangdao, Hebei, PR China
2. Department of Colorectal Cancer Surgery, The First Affiliated Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen 361003, Fujian Province, China
3. Department of Colorectal Cancer Surgery, The Third Clinical Medical College, Fujian Medical University, Fuzhou 350108, Fujian Province, China
4. Department of Gastrointestinal Surgery, Quanzhou First Hospital Affiliated to Fujian Medical University, Quanzhou City 362002, Fujian Province, China
5. Department of Cardiovascular Internal Medicine CCU Ward, First Hospital of Qinhuangdao, Qinhuangdao 066000, Hebei Province, China
6. Department of Gastrointestinal Surgery and Xiamen City Key Laboratory of Gastrointestinal Cancer, Zhongshan Hospital, Xiamen University, Xiamen 361000, Fujian Province, China