1. Department of Pathology, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong Province, China
2. Department of Pathology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, Guangdong Province, China
3. Department of Gastrointestinal Surgery, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong Province, China
4. Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University, Zhongshan Guangzhou, Guangdong Province, China
5. Department of Pathology, Guangzhou First Municipal People's Hospital, Guangzhou, Guangdong Province, China