@misc{indiciae9e5e0de13512,
  title = {Directionality in epidemiologic research.},
  author = {A R Feinstein},
  year = {1988},
  doi = {10.1016/0895-4356(88)90153-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/3418357/},
  note = {Source identifier: 3418357}
}