@misc{indiciaed06d090a4671,
  title = {Sample size calculator for cluster randomized trials.},
  author = {Marion K Campbell and Sean Thomson and Craig R Ramsay and Graeme S MacLennan and Jeremy M Grimshaw},
  year = {2004},
  doi = {10.1016/s0010-4825(03)00039-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/14972631/},
  note = {Source identifier: 14972631}
}