@misc{indiciaebd73e985a999,
  title = {Mitral valve replacement with a turtleneck-disc prosthesis.},
  author = {S S Oparah and J F Keefe and T J Ryan and R L Berger},
  year = {1975},
  url = {https://pubmed.ncbi.nlm.nih.gov/1117745/},
  note = {Source identifier: 1117745}
}