@misc{indiciae9e2d4906e511,
  title = {Cardiac prosthetic valve identification system.},
  author = {E C Harrison and M Matsuno and E J Roschke and J T Ikegami},
  year = {1973},
  doi = {10.1016/s0001-2092(07)60464-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4489137/},
  note = {Source identifier: 4489137}
}