@misc{indiciaeccfb8b175ce1,
  title = {Group sequential procedures for repeated events data with frailty.},
  author = {W Jiang},
  year = {1999},
  doi = {10.1081/bip-100101183},
  url = {https://pubmed.ncbi.nlm.nih.gov/10473027/},
  note = {Source identifier: 10473027}
}