@misc{indiciae95b81af207a6,
  title = {Matching in epidemiologic studies: validity and efficiency considerations.},
  author = {L L Kupper and J M Karon and D G Kleinbaum and H Morgenstern and D K Lewis},
  year = {1981},
  url = {https://pubmed.ncbi.nlm.nih.gov/7272415/},
  note = {Source identifier: 7272415}
}