@misc{indiciae7be657ad552d,
  title = {Models for longitudinal data: a generalized estimating equation approach.},
  author = {S L Zeger and K Y Liang and P S Albert},
  year = {1988},
  url = {https://pubmed.ncbi.nlm.nih.gov/3233245/},
  note = {Source identifier: 3233245}
}