@misc{indiciae129315c16612,
  title = {Sample size requirements for stratified cluster randomization designs.},
  author = {A Donner},
  year = {1992},
  doi = {10.1002/sim.4780110605},
  url = {https://pubmed.ncbi.nlm.nih.gov/1594813/},
  note = {Source identifier: 1594813}
}