@misc{indiciae7a29c41821dd,
  title = {Time-dependency in Cox's regression analysis.},
  author = {P G Mulder},
  year = {1987},
  doi = {10.1016/0021-9681(87)90055-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/3558712/},
  note = {Source identifier: 3558712}
}