@misc{indiciae4fa91aaa0c3c,
  title = {Determining ejection fraction by Doppler echocardiography.},
  author = {B Cujec and D Johnson},
  year = {1996},
  url = {https://pubmed.ncbi.nlm.nih.gov/9191514/},
  note = {Source identifier: 9191514}
}