TY - JOUR AU - Brenner, H; Stock, C; Hoffmeister, M TI - Effect of screening sigmoidoscopy and screening colonoscopy on colorectal cancer incidence and mortality: systematic review and meta-analysis of randomised controlled trials and observational studies JO - BMJ VL - 348 PY - 2014 DO - 10.1136/bmj.g2467 L3 - PubMed-ID: 24922745 SP - g2467 ER -