@misc{indiciae49c213d80006,
  title = {Pulse oximetry.},
  author = {M D Letko},
  doi = {10.1111/j.1552-6909.1992.tb01748.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/1403219/},
  note = {Source identifier: 1403219}
}