@misc{indiciaeff20990f3242,
  title = {Sample size in cluster randomisation.},
  author = {S M Kerry and J M Bland},
  year = {1998},
  doi = {10.1136/bmj.316.7130.549},
  url = {https://pubmed.ncbi.nlm.nih.gov/9501723/},
  note = {Source identifier: 9501723}
}