@misc{indiciaec9a0f51b273d,
  title = {Choosing between randomised and non-randomised studies: a systematic review},
  author = {MJ Campbell},
  year = {1998},
  doi = {10.1136/bmj.317.7167.1258a},
  url = {https://pubmed.ncbi.nlm.nih.gov/9794886/},
  note = {Source identifier: 9794886}
}