@misc{indiciae0fccab91c53c,
  title = {Tuberculin reversion rate.},
  author = {H G Calwell},
  year = {1977},
  doi = {10.1136/bmj.1.6068.1084-d},
  url = {https://pubmed.ncbi.nlm.nih.gov/858059/},
  note = {Source identifier: 858059}
}