@misc{indiciae9a10a7700333,
  title = {The electrocardiogram in population studies. A classification system.},
  author = {H BLACKBURN and A KEYS and E SIMONSON and P RAUTAHARJU and S PUNSAR},
  year = {1960},
  doi = {10.1161/01.cir.21.6.1160},
  url = {https://pubmed.ncbi.nlm.nih.gov/13849070/},
  note = {Source identifier: 13849070}
}