@misc{indiciae645a3ee99adc,
  title = {What is a normal electrocardiogram?},
  author = {F D JOHNSTON},
  year = {1961},
  doi = {10.1161/01.cir.24.4.707},
  url = {https://pubmed.ncbi.nlm.nih.gov/14452142/},
  note = {Source identifier: 14452142}
}