@misc{indiciae6fc5b7bbe543,
  title = {Doppler echocardiography.},
  author = {C G DeGroff},
  doi = {10.1007/s00246-001-0196-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/11976779/},
  note = {Source identifier: 11976779}
}