@misc{indiciaeb5dfca3ad0bf,
  title = {Changing P waves after mitral valve replacement.},
  author = {E W Hancock},
  year = {1983},
  doi = {10.1080/21548331.1983.11702664},
  url = {https://pubmed.ncbi.nlm.nih.gov/6413362/},
  note = {Source identifier: 6413362}
}