@misc{indiciae8003a9b58416,
  title = {Observer and experimental variation in tuberculin testing.},
  author = {K J Carruthers},
  year = {1970},
  doi = {10.1016/0041-3879(70)90128-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/5495336/},
  note = {Source identifier: 5495336}
}