@misc{indiciae835928526870,
  title = {Electrocardiographic changes during operations for mitral stenosis.},
  author = {M CAMPBELL and G REYNOLDS},
  year = {1952},
  doi = {10.1159/000165243},
  url = {https://pubmed.ncbi.nlm.nih.gov/13019819/},
  note = {Source identifier: 13019819}
}