@misc{indiciae5641f61a5d9e,
  title = {Before-and-after comparisons: a cautionary role.},
  author = {D Christie},
  doi = {10.1136/bmj.2.6205.1629-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/534920/},
  note = {Source identifier: 534920}
}