@misc{indiciae85fe927b8713,
  title = {An abnormal echo-free space behind the left atrium.},
  author = {David Sidebotham and James Lai},
  year = {2004},
  doi = {10.1053/j.jvca.2004.07.021},
  url = {https://pubmed.ncbi.nlm.nih.gov/15578486/},
  note = {Source identifier: 15578486}
}