TY - JOUR AU - Sieper, J; Appel, H; Braun, J TI - Critical appraisal of assessment of structural damage in ankylosing spondylitis: implications for treatment outcomes JO - Arthritis Rheum VL - 58 PY - 2008 DO - 10.1002/art.23260 L3 - PubMed-ID: 18311819 SP - 649 EP - 656 N1 - doi:10.1002/art.23260 ER -