1. Department of Gastrointestinal Surgery, Affiliated Guangzhou First Municipal People's Hospital, Guangzhou Medical College, Guangzhou, China,
2. Department of Gastrointestinal Surgery, Affiliated Guangzhou First Municipal People's Hospital, Guangzhou Medical College, Guangzhou, China
3. Department of Pathology, Affiliated Guangzhou First Municipal People's Hospital, Guangzhou Medical College, Guangzhou, China
4. Department of Gastroenterology, Affiliated Guangzhou First Municipal People's Hospital, Guangzhou Medical College, Guangzhou, China