@misc{indiciae5a605628bdf1,
  title = {Interim analysis in clinical trials.},
  author = {P Armitage},
  year = {1991},
  doi = {10.1002/sim.4780100613},
  url = {https://pubmed.ncbi.nlm.nih.gov/1876782/},
  note = {Source identifier: 1876782}
}