@misc{indiciae8a0fcc9977c4,
  title = {Defining operative mortality: it should be easy, but is it?},
  author = {William Williams},
  year = {2006},
  doi = {10.1016/j.athoracsur.2006.02.025},
  url = {https://pubmed.ncbi.nlm.nih.gov/16631634/},
  note = {Source identifier: 16631634}
}