Age-specific secular changes in oral contraceptive use.

@article{Shapiro1981AgespecificSC,
  title={Age-specific secular changes in oral contraceptive use.},
  author={Samuel Shapiro and Dennis Slone and E R Neff},
  journal={American journal of epidemiology},
  year={1981},
  volume={114 4},
  pages={604}
}

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