1. Guangdong Provincial Key Laboratory of Gastroenterology, Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, 510515, China
2. Guangdong Provincial Key Laboratory of Colorectal Diseases, Department of Gastroenterology, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510655, China