@misc{indiciae524209924b35,
  title = {Ankylosing spondylitis and auto-immunity.},
  author = {G O Cowan},
  year = {1973},
  doi = {10.1136/pgmj.49.575.667},
  url = {https://pubmed.ncbi.nlm.nih.gov/4788922/},
  note = {Source identifier: 4788922}
}