@misc{indiciae80c5d064d46d,
  title = {Echocardiography.},
  author = {J B Chambers and M J Monaghan and G Jackson},
  year = {1988},
  doi = {10.1136/bmj.297.6656.1071},
  url = {https://pubmed.ncbi.nlm.nih.gov/3143434/},
  note = {Source identifier: 3143434}
}