@misc{indiciae95dbe36d717c,
  title = {External quality assessment.},
  author = {C G Simpson},
  year = {1992},
  doi = {10.1136/jcp.45.7.642-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/1517471/},
  note = {Source identifier: 1517471}
}