@misc{indiciae85e18820bfad,
  title = {Letter: Which prosthetic valve?},
  author = {D P Lang},
  year = {1976},
  doi = {10.1016/s0140-6736(76)92197-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/58292/},
  note = {Source identifier: 58292}
}