@misc{indiciae59a5b168e4d3,
  title = {An empirical study of cluster randomization.},
  author = {A Donner},
  year = {1982},
  doi = {10.1093/ije/11.3.283},
  url = {https://pubmed.ncbi.nlm.nih.gov/7129743/},
  note = {Source identifier: 7129743}
}