@misc{indiciae77632447fa53,
  title = {Using permutation tests and bootstrap confidence limits to analyze repeated events data from clinical trials.},
  author = {L Freedman and R Sylvester and D P Byar},
  year = {1989},
  doi = {10.1016/0197-2456(89)90026-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/2752763/},
  note = {Source identifier: 2752763}
}