@misc{indiciae1fe388da7463,
  title = {Echocardiography.},
  author = {I G McDonald},
  year = {1972},
  doi = {10.5694/j.1326-5377.1972.tb92997.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4570153/},
  note = {Source identifier: 4570153}
}