Twin-twin transfusion syndrome.

@article{Fisk1995TwintwinTS,
  title={Twin-twin transfusion syndrome.},
  author={Nicholas M Fisk and Rekha Bajoria and John Wigglesworth},
  journal={The New England journal of medicine},
  year={1995},
  volume={333 6},
  pages={388; author reply 388-9}
}