A method of imputing length of gestation on birth certificates.

@article{Taffel1982AMO,
  title={A method of imputing length of gestation on birth certificates.},
  author={S M Taffel and Dennis Johnson and Richard R Heuser},
  journal={Vital and health statistics. Series 2, Data evaluation and methods research},
  year={1982},
  volume={93},
  pages={1-11}
}