1. Laboratory of General Surgery, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China
2. Center for Inflammatory Bowel Disease, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, Cleveland, OH, USA
3. Department of Colorectal Surgery and Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, the Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, P.R. China