@misc{indiciae0a6b3e007368,
  title = {Study designs for dependent happenings.},
  author = {M E Halloran and C J Struchiner},
  year = {1991},
  doi = {10.1097/00001648-199109000-00004},
  url = {https://pubmed.ncbi.nlm.nih.gov/1742381/},
  note = {Source identifier: 1742381}
}