TY - JOUR AU - Barclay, R L; Vicari, J J; Greenlaw, R L TI - Effect of a time-dependent colonoscopic withdrawal protocol on adenoma detection during screening colonoscopy JO - Clin Gastroenterol Hepatol VL - 6 PY - 2008 DO - 10.1016/j.cgh.2008.04.018 L3 - PubMed-ID: 18639495 SP - 1091 EP - 1098 ER -