1 From the Department of Gastrointestinal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
2 Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
3 Department of Colorectal Surgery, Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China.
4 Department of Colorectal Surgery, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China.
5 Department of Microbiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.