@misc{indiciaea92944ef4677,
  title = {Opioids in labour.},
  author = {R Twycross},
  year = {1997},
  doi = {10.1016/s0140-6736(05)60162-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/9078216/},
  note = {Source identifier: 9078216}
}