@misc{indiciae2b1f2fd1a5bb,
  title = {Observer and site variation in multiple puncture tuberculin testing.},
  author = {S GILLIS and P STRADLING},
  year = {1957},
  doi = {10.1016/s0041-3879(57)80068-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/13401509/},
  note = {Source identifier: 13401509}
}