@misc{indiciae0e72b17dd41b,
  title = {DECLINING TUBERCULIN SENSITIVITY WITH ADVANCING AGE.},
  author = {R N JOHNSTON and R T RITCHIE and I H MURRAY},
  year = {1963},
  doi = {10.1136/bmj.2.5359.720},
  url = {https://pubmed.ncbi.nlm.nih.gov/14043732/},
  note = {Source identifier: 14043732}
}