@misc{indiciaea1f13e4d839f,
  title = {Extradural opioids in labour.},
  author = {N L Herman and F L Hussain and K G Knape and J W Downing},
  year = {1990},
  doi = {10.1093/bja/64.4.528-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/1970739/},
  note = {Source identifier: 1970739}
}