@misc{indiciae9f742867fdbf,
  title = {Experimental intracardiac visualization.},
  author = {W J Gamble and R E Innis},
  year = {1967},
  doi = {10.1056/nejm196706222762502},
  url = {https://pubmed.ncbi.nlm.nih.gov/6026404/},
  note = {Source identifier: 6026404}
}