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Fig. 2. —Graph shows self-reported influence of published guidelines on physicians' colorectal cancer screening practice. Black bars represent diagnostic radiologists; white bars represent primary care physicians. Differences are statistically significant at p < 0.0001 for the American Cancer Society and the United States Preventive Services Task Force, and at p<0.005 for the G. I. (Gastrointestinal) Consortium and other specialty societies.