@misc{indiciae67d00bc5d8a2,
  title = {Clustered data.},
  author = {G Fitzmaurice},
  year = {2001},
  doi = {10.1016/s0899-9007(01)00539-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/11399413/},
  note = {Source identifier: 11399413}
}