The need for ALS in urban and suburban EMS systems.

@article{Ornato1990TheNF,
  title={The need for ALS in urban and suburban EMS systems.},
  author={Joseph P. Ornato and Edward M. Racht and Joseph Jay Fitch and Jean-Paul Berry},
  journal={Annals of emergency medicine},
  year={1990},
  volume={19 12},
  pages={1469-70}
}