The second procedure will be done with the same level of careful inspection as the first although we not specifically regiment the time of withdrawal beyond what the endoscopist feels is necessary for a careful examination. During the second colonoscopy all visualized polyps will be noted, photographed and removed. During the first procedure, the time will be evaluated with a stopwatch. The stopwatch will start when the endoscopist begins pull-back at the cecum and end when the scope is removed from the anal verge. The clock will be stopped during washing of the bowel, polypectomy, biopsy or any other therapeutic maneuver. At the end of the first procedure, the endoscopist will be informed of the withdrawal and inspection time and every effort will be made to match this to the second procedure. Time will be recorded similarly for the second procedure. Polyps will be classified as pedunculated, raised-sessile (rounded) or flat. Flat polyps will be further classified according to the Paris endoscopic classification 14.