@misc{indiciae84fffa533783,
  title = {Vertebral osteoporosis in ankylosing spondylitis.},
  author = {C A Hanson and J W Shagrin and H Duncan},
  year = {1971},
  url = {https://pubmed.ncbi.nlm.nih.gov/5540407/},
  note = {Source identifier: 5540407}
}