'Idiopathic' pulmonary embolism.

@article{Portale2003IdiopathicPE,
  title={'Idiopathic' pulmonary embolism.},
  author={Grazia Portale and Marinella Mazzone and Francesco Travaglino and Francesco Buccelletti and Nicol{\'o} Gentiloni-Silveri},
  journal={The American journal of emergency medicine},
  year={2003},
  volume={21 3},
  pages={245-6}
}