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van der Heijde D, Sieper J, Maksymowych WP, Dougados M, Burgos-Vargas R, Landewé R, Rudwaleit M, Braun J; Assessment of SpondyloArthritis international Society.van der Heijde D, et al. Among authors: sieper j.Ann Rheum Dis. 2011 Jun;70(6):905-8. doi: 10.1136/ard.2011.151563.Ann Rheum Dis. 2011.PMID: 21540200