@misc{indiciaec79201552e68,
  title = {What is prolonged intubation?},
  author = {S Johnsen},
  year = {1973},
  doi = {10.3109/00016487309139756},
  url = {https://pubmed.ncbi.nlm.nih.gov/4702654/},
  note = {Source identifier: 4702654}
}