@misc{indiciae8569181c7a8e,
  title = {Obstetric pain relief using epidural morphine.},
  author = {P D Booker and R G Wilkes and T H Bryson and J Beddard},
  year = {1980},
  doi = {10.1111/j.1365-2044.1980.tb05123.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/7435900/},
  note = {Source identifier: 7435900}
}