@misc{indiciaeb51bada5863c,
  title = {Power determination for geographically clustered data using generalized estimating equations.},
  author = {S A Hendricks and J T Wassell and J W Collins and S L Sedlak},
  doi = {10.1002/(sici)1097-0258(19960930)15:18<1951::aid-sim407>3.0.co;2-p},
  url = {https://pubmed.ncbi.nlm.nih.gov/8888487/},
  note = {Source identifier: 8888487}
}