@misc{indiciae884d52d2d1d7,
  title = {Confidence interval construction for effect measures arising from cluster randomization trials.},
  author = {A Donner and N Klar},
  year = {1993},
  doi = {10.1016/0895-4356(93)90050-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/8437028/},
  note = {Source identifier: 8437028}
}