Axial Involvement in Psoriatic Arthritis cohort (AXIS): the protocol of a joint project of the Assessment of SpondyloArthritis international Society (ASAS) and the Group for Resear... by Poddubnyy, D, Baraliakos, X, Van den Bosch, F, Braun, J, Coates, LC, Chandran, V, Diekhoff, T, van Gaalen, FA, Gensler, LS, Goel, N, Gottlieb, AB, van der Heijde, D, Helliwell, PS, Hermann, KGA, Jadon, D, Lambert, RG, Maksymowych, WP, Mease, P, Nash, P, Proft, F, Protopopov, M, Sieper, J, Torgutalp, M, Gladman, DD

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