TY - JOUR AU - Winawer, S J; Zauber, A G; O'Brien, M JThe National Polyp Study Workgroup TI - Randomized comparison of surveillance intervals after colonoscopic removal of newly diagnosed adenomatous polyps JO - N Engl J Med VL - 328 PY - 1993 DO - 10.1056/NEJM199304013281301 L3 - PubMed-ID: 8446136 SP - 901 EP - 906 N1 - et al. ER -