@misc{indiciae1e89fef44cf2,
  title = {The electrocardiogram in old age.},
  author = {P HAGEN and Z FREEMAN},
  year = {1950},
  doi = {10.5694/j.1326-5377.1950.tb80465.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/15416377/},
  note = {Source identifier: 15416377}
}