@misc{indiciae038fb6c41d22,
  title = {The coronary collateral circulation.},
  author = {R H Helfant and R Gorlin},
  year = {1972},
  doi = {10.7326/0003-4819-77-6-995},
  url = {https://pubmed.ncbi.nlm.nih.gov/4644174/},
  note = {Source identifier: 4644174}
}