@misc{indiciaec696f3eb8e18,
  title = {Heart rate variability.},
  author = {C A Calvert},
  year = {1998},
  doi = {10.1016/s0195-5616(98)50129-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/10098245/},
  note = {Source identifier: 10098245}
}