1. Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
2. Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
3. Department of Gastroenterology/Hepatology, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China