TY - JOUR AU - Rudwaleit, M; van der Heijde, D; Landewe, R TI - The development of Assessment of SpondyloArthritis international Society classification criteria for axial spondyloarthritis (part II): validation and final selection JO - Ann Rheum Dis VL - 68 PY - 2009 DO - 10.1136/ard.2009.108233 SP - 777 EP - 783 N1 - et al. ER -