@misc{indiciaeb57596605de3,
  title = {Balance in cluster randomized trials.},
  author = {G M Raab and I Butcher},
  year = {2001},
  doi = {10.1002/1097-0258(20010215)20:3<351::aid-sim797>3.0.co;2-c},
  url = {https://pubmed.ncbi.nlm.nih.gov/11180306/},
  note = {Source identifier: 11180306}
}