@misc{indiciaee5d7132faacd,
  title = {Simple sample size calculation for cluster-randomized trials.},
  author = {R J Hayes and S Bennett},
  year = {1999},
  doi = {10.1093/ije/28.2.319},
  url = {https://pubmed.ncbi.nlm.nih.gov/10342698/},
  note = {Source identifier: 10342698}
}