Unwanted pregnancy on self-medication with St John's wort despite hormonal contraception.

@article{Schwarz2003UnwantedPO,
  title={Unwanted pregnancy on self-medication with St John's wort despite hormonal contraception.},
  author={Ute I. Schwarz and Barbara B{\"u}schel and Wilhelm Kirch},
  journal={British journal of clinical pharmacology},
  year={2003},
  volume={55 1},
  pages={112-3}
}