Selection factors in cohort studies.

@article{Nicholson1985SelectionFI,
  title={Selection factors in cohort studies.},
  author={William J. Nicholson},
  journal={National Cancer Institute monograph},
  year={1985},
  volume={67},
  pages={
          111-5
        }
}
Cohort studies play an important role in the quantitation of cancer risk among occupationally exposed individuals. Properly conducted cohort studies can develop important data on the age, time, and exposure dependence of cancer risk. Such information allows identification of possible selection effects which may be present and allows generalization of risk estimates to other exposure circumstances. 

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