TY - JOUR AU - Newcomb, P A TI - Screening sigmoidoscopy and colorectal cancer mortality JO - J Natl Cancer Inst VL - 84 PY - 1992 DO - 10.1093/jnci/84.20.1572 L3 - PubMed-ID: 1404450 SP - 1572 EP - 1575 N1 - et al. ER -