@misc{indiciaefca8bf0973f0,
  title = {Heterograft aortic-valve replacement.},
  author = {M F O'Brien and J K Clareborough},
  year = {1967},
  doi = {10.1016/s0140-6736(67)91491-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4164403/},
  note = {Source identifier: 4164403}
}