@misc{indiciae474a47f2edbb,
  title = {Aspirin and extradural blocks.},
  author = {R Macdonald},
  year = {1991},
  doi = {10.1093/bja/66.1.1},
  url = {https://pubmed.ncbi.nlm.nih.gov/1997043/},
  note = {Source identifier: 1997043}
}