@misc{indiciaeacf90ea4c5d3,
  title = {Letter: Pulmonary valve ring size.},
  author = {F C Spencer},
  year = {1976},
  doi = {10.1016/s0003-4975(10)63940-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/1275613/},
  note = {Source identifier: 1275613}
}