@misc{indiciae6d7d55997944,
  title = {Prevalence, incidence and duration.},
  author = {J Freeman and G B Hutchison},
  year = {1980},
  doi = {10.1093/oxfordjournals.aje.a113043},
  url = {https://pubmed.ncbi.nlm.nih.gov/6969024/},
  note = {Source identifier: 6969024}
}