@misc{indiciae19f792616e6c,
  title = {Certification update.},
  author = {L S Andrews},
  year = {1991},
  doi = {10.1097/00001610-199110000-00011},
  url = {https://pubmed.ncbi.nlm.nih.gov/1932162/},
  note = {Source identifier: 1932162}
}