@misc{indiciaeb00cecbe5596,
  title = {Observational studies identify associations, not causality.},
  author = {Arnold J Berry},
  year = {2005},
  doi = {10.1213/01.ane.0000173754.86959.9d},
  url = {https://pubmed.ncbi.nlm.nih.gov/16192554/},
  note = {Source identifier: 16192554}
}