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Annual Mammograms Necessary?

http://www.youtube.com/watch?feature=player_detailpage&v=UQ6acdVIm44&list=UU6ZFN9Tx6xh-skXCuRHCDpQ

Annual mammograms have been seen as an important screening tool: They are very effective in helping find small, slow-growing cancers. But how good are they at finding fatal tumors? Health correspondent Betty Ann Bowser reports on a recent study published in the New England Journal of Medicine that has reignited the debate.