"Effect of Flexible Sigmoidoscopy Screening on Colorectal Cancer Incidence and Mortality"
"Conclusions and Relevance In Norway, once-only flexible sigmoidoscopy screening or flexible sigmoidoscopy and FOBT reduced colorectal cancer incidence and mortality on a population level compared with no screening. Screening was effective both in the 50- to 54-year and the 55- to 64-year age groups."
http://jama.jamanetwork.com/article.aspx?articleid=1895247
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