@misc{indiciae5384437e5d8d,
  title = {Heart rate variability.},
  author = {M Malik},
  year = {1998},
  doi = {10.1097/00001573-199801000-00006},
  url = {https://pubmed.ncbi.nlm.nih.gov/9559255/},
  note = {Source identifier: 9559255}
}