@misc{indiciae34040bafa92b,
  title = {Fenestrated tracheostomy tubes.},
  author = {N V Freeman},
  year = {1973},
  doi = {10.1016/s0140-6736(73)93160-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/4124445/},
  note = {Source identifier: 4124445}
}