@misc{indiciae07c60fe774cb,
  title = {Aortic valve replacement in the elderly.},
  author = {P N Ruygrok and B G Barratt-Boyes and T M Agnew and H A Coverdale and A R Kerr and R M Whitlock},
  year = {1993},
  url = {https://pubmed.ncbi.nlm.nih.gov/8269166/},
  note = {Source identifier: 8269166}
}