@misc{indiciae17f55504deae,
  title = {Open heart surgery in the elderly.},
  year = {1973},
  doi = {10.5694/j.1326-5377.1973.tb110579.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4700548/},
  note = {Source identifier: 4700548}
}