@misc{indiciaeff544541d936,
  title = {Valve replacement without preoperative cardiac catheterization.},
  author = {B Margolis and M Kirschbaum},
  year = {1982},
  doi = {10.1056/nejm198204083061415},
  url = {https://pubmed.ncbi.nlm.nih.gov/7062968/},
  note = {Source identifier: 7062968}
}