@misc{indiciaecedd00241e02,
  title = {Heart valve replacement.},
  author = {H N Macdonald},
  year = {1970},
  doi = {10.1136/bmj.3.5717.286-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/5448814/},
  note = {Source identifier: 5448814}
}