@misc{indiciaeae5235034d98,
  title = {Difficulties in evaluating non-randomized studies.},
  author = {R Arriagada and A Auquier},
  year = {1989},
  doi = {10.1016/0167-8140(89)90099-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2672123/},
  note = {Source identifier: 2672123}
}