"Colonoscopies prevent death, study finds; Results of cancer screening show death rate cut 53%" by Denise Grady | New York Times, February 23, 2012
Colonoscopy is expensive, costing hundreds or thousands of dollars, depending on whether polyps are removed and on the part of the country where it is done. It also carries small risks of causing bleeding or perforation of the intestine. And it requires sedation and taking strong, usually foul-tasting laxatives to clean out the intestines so that the doctor can look for polyps.
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