@misc{indiciae0daecaffa9fb,
  title = {Long-standing ankylosing spondylitis with back pain.},
  author = {L Laurent-Haupt and K D Westmark},
  year = {1991},
  url = {https://pubmed.ncbi.nlm.nih.gov/1947310/},
  note = {Source identifier: 1947310}
}