@misc{indiciae5cfda60b2c01,
  title = {Echocardiography.},
  author = {C R Joyner},
  year = {1972},
  doi = {10.1161/01.cir.46.5.835},
  url = {https://pubmed.ncbi.nlm.nih.gov/5081138/},
  note = {Source identifier: 5081138}
}