@misc{indiciaecd8354e45233,
  title = {Observational evidence.},
  author = {C H Hennekens and J E Buring},
  year = {1993},
  doi = {10.1111/j.1749-6632.1993.tb26330.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/8192295/},
  note = {Source identifier: 8192295}
}