@misc{indiciaeedadd5fc0c32,
  title = {Variance estimators for attributable fraction estimates consistent in both large strata and sparse data.},
  author = {S Greenland},
  year = {1987},
  doi = {10.1002/sim.4780060607},
  url = {https://pubmed.ncbi.nlm.nih.gov/2825320/},
  note = {Source identifier: 2825320}
}