@misc{indiciae638902de49cf,
  title = {Improved plastic endotracheal tubes.},
  author = {M K Sykes},
  year = {1968},
  doi = {10.1136/bmj.2.5598.171},
  url = {https://pubmed.ncbi.nlm.nih.gov/5641985/},
  note = {Source identifier: 5641985}
}