@misc{indiciae5aa6c6e36038,
  title = {Reliability of rheumatoid factor tests.},
  author = {R von Essen and M V Lehtinen and J A Räsänen and O Wager},
  year = {1984},
  doi = {10.1093/rheumatology/23.4.312},
  url = {https://pubmed.ncbi.nlm.nih.gov/6487940/},
  note = {Source identifier: 6487940}
}