@misc{indiciaecf49fd133a51,
  title = {Letter: Ballistocardiography.},
  author = {W Dock},
  year = {1976},
  doi = {10.1016/s0140-6736(76)91652-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/56624/},
  note = {Source identifier: 56624}
}