@misc{indiciaeed502a56816b,
  title = {Group sequential methods for cohort and case-control studies.},
  author = {B S Pasternak and R E Shore},
  year = {1980},
  doi = {10.1016/0021-9681(80)90046-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/7372772/},
  note = {Source identifier: 7372772}
}