@misc{indiciae5ae0c53172f2,
  title = {Opioids in labour.},
  author = {C Littler and J Sleep and R McCandish and D Elbourne},
  year = {1997},
  doi = {10.1016/s0140-6736(05)60164-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9078218/},
  note = {Source identifier: 9078218}
}