@misc{indiciaebe8c5387d940,
  title = {Echocardiographic evaluation of left ventricular function.},
  author = {R L Popp},
  year = {1977},
  doi = {10.1056/nejm197704142961506},
  url = {https://pubmed.ncbi.nlm.nih.gov/846495/},
  note = {Source identifier: 846495}
}