Section of Gastroenterology,Hepatology and Nutrition,Department of Medicine,The University of Chicago Medicine,Chicago,IL 60637,United States;
Section of Gastroenterology,Carle Hospital,University of Illinois,Urbana,IL 61801,United States;
Digestive and Lifestyle Diseases,Kagoshima University Graduate School of Medical and Dental Sciences,Kagoshima 890-8544,Japan;
Ulcerative colitis; Surveillance; Dysplasia; Network meta-analysis; Endoscopy;