Effect of screening mammography on breast-cancer mortality in Norway.

@article{Kalager2010EffectOS,
  title={Effect of screening mammography on breast-cancer mortality in Norway.},
  author={Mette Kalager and Marvin Zelen and Fr{\o}ydis Langmark and Hans-Olov Adami},
  journal={The New England journal of medicine},
  year={2010},
  volume={363 13},
  pages={
          1203-10
        }
}
BACKGROUND A challenge in quantifying the effect of screening mammography on breast-cancer mortality is to provide valid comparison groups. The use of historical control subjects does not take into account chronologic trends associated with advances in breast-cancer awareness and treatment. METHODS The Norwegian breast-cancer screening program was started in 1996 and expanded geographically during the subsequent 9 years. Women between the ages of 50 and 69 years were offered screening… 
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