@misc{indiciaef3cda4e8f65d,
  title = {Letter: Sick sinus syndrome.},
  author = {J H Horgan},
  year = {1973},
  doi = {10.1136/bmj.4.5884.111-d},
  url = {https://pubmed.ncbi.nlm.nih.gov/4745337/},
  note = {Source identifier: 4745337}
}