1. Department of Gastroenterology, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
2. Department of Pathology, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
3. Department of Radiology, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
4. Clinical Trial Unit, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
5. Institute of Precision Medicine, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China