Critical appraisal of assessment of structural damage in ankylosing spondylitis: implications for treatment outcomes.

@article{Sieper2008CriticalAO,
  title={Critical appraisal of assessment of structural damage in ankylosing spondylitis: implications for treatment outcomes.},
  author={Joachim Sieper and Heiner Appel and J{\"u}rgen Braun and Mart{\'i}n Rudwaleit},
  journal={Arthritis and rheumatism},
  year={2008},
  volume={58 3},
  pages={649-56}
}