@misc{indiciae605b550323ab,
  title = {Improved hypothesis testing for coefficients in generalized estimating equations with small samples of clusters.},
  author = {Daniel F McCaffrey and Robert M Bell},
  year = {2006},
  doi = {10.1002/sim.2502},
  url = {https://pubmed.ncbi.nlm.nih.gov/16456895/},
  note = {Source identifier: 16456895}
}