Division of Gastroenterology and Hepatology,Department of Medicine,University of Missouri-Columbia,Columbia,MO 65212,United States;
Division of Gastroenterology,Heart of the Rockies Regional Medical Center,Colorado Springs,CO 80907,United States;
Division of Gastroenterology,University of Illinois-Peoria,Peoria,IL 61604,United States;
Afternoon; Colonoscopy; Preparation; Split-dose; Same-day; Meta-analysis;