@misc{indiciae2b5ca8a82ecc,
  title = {Permutation tests for comparing marginal survival functions with clustered failure time data.},
  author = {J Cai and Y Shen},
  year = {2000},
  doi = {10.1002/1097-0258(20001115)19:21<2963::aid-sim593>3.0.co;2-h},
  url = {https://pubmed.ncbi.nlm.nih.gov/11042626/},
  note = {Source identifier: 11042626}
}