@misc{indiciae0c2bc05e1a76,
  title = {External quality assurance.},
  author = {J G Ratcliffe},
  year = {1998},
  doi = {10.1177/000456329803500413},
  url = {https://pubmed.ncbi.nlm.nih.gov/9681061/},
  note = {Source identifier: 9681061}
}