@misc{indiciae1400d33a8db3,
  title = {Calculating confidence intervals for survival time analyses.},
  author = {D Machin and M J Gardner},
  year = {1988},
  doi = {10.1136/bmj.296.6633.1369},
  url = {https://pubmed.ncbi.nlm.nih.gov/3134990/},
  note = {Source identifier: 3134990}
}