@misc{indiciaea291d0808bc1,
  title = {Valve replacement in the octogenarian.},
  author = {A C Fiore and K S Naunheim and H B Barner and D G Pennington and L R McBride and G C Kaiser and V L Willman},
  year = {1989},
  doi = {10.1016/0003-4975(89)90189-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2764587/},
  note = {Source identifier: 2764587}
}