@misc{indiciae61375fd8febe,
  title = {Lab proficiency tests mandated.},
  author = {E S Ray},
  year = {1993},
  doi = {10.1097/00006205-199312000-00001},
  url = {https://pubmed.ncbi.nlm.nih.gov/8108045/},
  note = {Source identifier: 8108045}
}