@misc{indiciae449be57bd33f,
  title = {Mitral valve replacement.},
  author = {D E Harken and J J Collins},
  year = {1969},
  doi = {10.1016/0033-0620(69)90053-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4884689/},
  note = {Source identifier: 4884689}
}