Unsuspected early pregnancy at hysterosalpingography.

@article{Jongen2001UnsuspectedEP,
  title={Unsuspected early pregnancy at hysterosalpingography.},
  author={Vincent H W M Jongen and Joseph M. Collins and Jaap Lubbers and Maria van Selm},
  journal={Fertility and sterility},
  year={2001},
  volume={76 3},
  pages={610-1}
}