Posterior urethral valves in twins with mirror image abnormalities.

@article{Williams1993PosteriorUV,
  title={Posterior urethral valves in twins with mirror image abnormalities.},
  author={N M Williams and Leela Kapila},
  journal={British journal of urology},
  year={1993},
  volume={71 5},
  pages={615-6}
}