@misc{indiciaecfa8a24e4abe,
  title = {Alternative designs to study outcomes: the tonsillectomy case.},
  author = {L L Roos},
  year = {1979},
  doi = {10.1097/00005650-197911000-00001},
  url = {https://pubmed.ncbi.nlm.nih.gov/502614/},
  note = {Source identifier: 502614}
}