@misc{indiciae7269e7222de1,
  title = {Randomization, statistics, and causal inference.},
  author = {S Greenland},
  year = {1990},
  doi = {10.1097/00001648-199011000-00003},
  url = {https://pubmed.ncbi.nlm.nih.gov/2090279/},
  note = {Source identifier: 2090279}
}