@misc{indiciae7ef3e94e28eb,
  title = {Systems modification in obstetric analgesia.},
  author = {I D Levack and M E Tunstall},
  year = {1984},
  doi = {10.1111/j.1365-2044.1984.tb09512.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6703274/},
  note = {Source identifier: 6703274}
}