@misc{indiciae9d84ccc48382,
  title = {Nonexperimental approaches to determining causality.},
  author = {K B Haller},
  doi = {10.1097/00005721-198903000-00020},
  url = {https://pubmed.ncbi.nlm.nih.gov/2495415/},
  note = {Source identifier: 2495415}
}