@misc{indiciae38292d6c2d50,
  title = {Extradural opioids.},
  author = {N G Smart},
  year = {1991},
  doi = {10.1093/bja/66.5.628-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/2031827/},
  note = {Source identifier: 2031827}
}