@misc{indiciaeeaa68ff20a39,
  title = {Beat by beat variations.},
  author = {Polychronis Dilaveris and Georgios Giannopoulos and Maria Riga and Andreas Synetos and Christodoulos Stefanadis},
  year = {2007},
  doi = {10.1016/j.amjmed.2006.10.009},
  url = {https://pubmed.ncbi.nlm.nih.gov/17208074/},
  note = {Source identifier: 17208074}
}