@misc{indiciae656a95625541,
  title = {Extradural catheterization.},
  author = {A P Andersen and J Sörensen},
  year = {1998},
  doi = {10.1093/bja/81.2.298},
  url = {https://pubmed.ncbi.nlm.nih.gov/9813547/},
  note = {Source identifier: 9813547}
}