@misc{indiciae4fc91b9e1e23,
  title = {Endoscopy is useful during percutaneous tracheostomy.},
  author = {Paul Jefferson and David R Ball},
  year = {2002},
  doi = {10.1136/bmj.324.7343.977/b},
  url = {https://pubmed.ncbi.nlm.nih.gov/11964355/},
  note = {Source identifier: 11964355}
}