@misc{indiciae56b1d14bef06,
  title = {Which deep breathing device should the postoperative patient use?},
  author = {D H Lederer and J M Van de Water and R B Indech},
  year = {1980},
  doi = {10.1378/chest.77.5.610},
  url = {https://pubmed.ncbi.nlm.nih.gov/7363678/},
  note = {Source identifier: 7363678}
}