Content and Face Validity and Feasibility of 5 Candidate Instruments for Psoriatic Arthritis Randomized Controlled Trials: The PsA OMERACT Core Set Workshop at the GRAPPA 2017 Annual Meeting

Richard Holland, William Tillett, Alexis Ogdie, Ying Y Leung, Dafna D Gladman, Kristina Callis Duffin, Laura C Coates, Philip J Mease, Lihi Eder, Vibeke Strand, Musaab Elmamoun, Pil Højgaard, Jeffrey Chau, Maarten de Wit, Niti Goel, Chris A Lindsay, Oliver FitzGerald, Bev Shea, Dorcas Beaton, Ana-Maria Orbai