Prevention of neural tube defect recurrences in Yorkshire: final report.

@article{Smithells1989PreventionON,
  title={Prevention of neural tube defect recurrences in Yorkshire: final report.},
  author={Richard Smithells and Sandra Sheppard and Jan Wild and Chris J Schorah},
  journal={Lancet},
  year={1989},
  volume={2 8661},
  pages={498-9}
}