@misc{indiciaedd69684800c3,
  title = {Methodological bias in cluster randomised trials.},
  author = {Seokyung Hahn and Suezann Puffer and David J Torgerson and Judith Watson},
  year = {2005},
  doi = {10.1186/1471-2288-5-10},
  url = {https://pubmed.ncbi.nlm.nih.gov/15743523/},
  note = {Source identifier: 15743523}
}