Sensitivity of pocket Doppler fetal heart detectors in early pregnancy: a comparative study.

@article{Waterstone1993SensitivityOP,
  title={Sensitivity of pocket Doppler fetal heart detectors in early pregnancy: a comparative study.},
  author={John Justin Waterstone and Stuart Campbell},
  journal={British journal of obstetrics and gynaecology},
  year={1993},
  volume={100 2},
  pages={189-90}
}