1. Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510655, China
2. Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510655, China
3. Division of Colorectal Surgery, New York-Presbyterian Hospital, Columbia University Medical Center, New York 10032, USA
4. Department of Gastroenterology/Hepatology, The Cleveland Clinic Foundation, Cleveland, Ohio 44111, USA