1. Guangdong Institute of Gastroenterology, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases , Guangzhou, Guangdong, P. R. China
2. Department of General Surgery (Colorectal Surgery), The Sixth Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
3. Artificial Intelligence Medical Research Center, School of Intelligent Systems Engineering, Sun Yat-sen University , Shenzhen, Guangdong, P. R. China
4. Department of Clinical Laboratory, The Sixth Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China