@misc{indiciae1ec2f4e202c5,
  title = {Sample size for studying intermediate endpoints within intervention trails or observational studies.},
  author = {L S Freedman and A Schatzkin},
  year = {1992},
  doi = {10.1093/oxfordjournals.aje.a116581},
  url = {https://pubmed.ncbi.nlm.nih.gov/1462974/},
  note = {Source identifier: 1462974}
}