@misc{indiciae51cc79d0bcd7,
  title = {Echocardiography.},
  year = {1977},
  doi = {10.5694/j.1326-5377.1977.tb130755.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/559906/},
  note = {Source identifier: 559906}
}