sj-7z-3-tab-10.1177_1759720X211057975 – Supplemental material for 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 Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA)

Supplemental material, sj-7z-3-tab-10.1177_1759720X211057975 for 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 Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) by Denis Poddubnyy, Xenofon Baraliakos, Filip Van den Bosch, Jürgen Braun, Laura C. Coates, Vinod Chandran, Torsten Diekhoff, Floris A. van Gaalen, Lianne S. Gensler, Niti Goel, Alice B. Gottlieb, Désirée van der Heijde, Philip S. Helliwell, Kay Geert A. Hermann, Deepak Jadon, Robert G. Lambert, Walter P. Maksymowych, Philip Mease, Peter Nash, Fabian Proft, Mikhail Protopopov, Joachim Sieper, Murat Torgutalp and Dafna D. Gladman in Therapeutic Advances in Musculoskeletal Disease