@misc{indiciae8613f3d6afe5,
  title = {Perioperative echocardiographic evaluation.},
  author = {R G Williams},
  year = {1989},
  doi = {10.1007/bf01795116},
  url = {https://pubmed.ncbi.nlm.nih.gov/2664012/},
  note = {Source identifier: 2664012}
}