@misc{indiciaea1a63748b92e,
  title = {The second-strength PPD test.},
  author = {K K Hunt},
  year = {1971},
  doi = {10.1056/nejm197106102842313},
  url = {https://pubmed.ncbi.nlm.nih.gov/5576446/},
  note = {Source identifier: 5576446}
}