TY - JOUR AU - El-Maraghi, R H; Kielar, A Z TI - CT Colonography Versus Optical Colonoscopy for Screening Asymptomatic Patients for Colorectal Cancer: A Patient, Intervention, Comparison, Outcome (PICO) Analysis JO - Academic Radiology VL - 16 PY - 2009 DO - 10.1016/j.acra.2009.01.008 SP - 564 EP - 571 ER -