@misc{indiciae7997d3017f44,
  title = {Echocardiography (2)},
  author = {R L Popp},
  year = {1990},
  doi = {10.1056/nejm199007193230305},
  url = {https://pubmed.ncbi.nlm.nih.gov/2194129/},
  note = {Source identifier: 2194129}
}