Content and Face Validity and Feasibility of 5 Candidate Instruments for Psoriatic Arthritis Randomized Controlled...

Richard Holland^1,2, William Tillett^1,2, Alexis Ogdie^1,2+17

• ¹From the Royal Prince Alfred Hospital Medical Centre, Sydney, Australia; Royal National Hospital for Rheumatic Diseases, Bath, UK; University of Pennsylvania, Philadelphia, Pennsylvania, USA; Department of Rheumatology and Immunology, Singapore General Hospital, Singapore; University of Toronto, Krembil Research Institute, Psoriatic Arthritis Program, University Health Network, Toronto, Ontario, Canada; Department of Dermatology, University of Utah, Salt Lake City, Utah, USA; University of Oxford, Oxford, UK; Swedish Medical Center and University of Washington School of Medicine, Seattle, Washington, USA; Women's College Research Institute, Women's College Hospital, University of Toronto, Toronto, Ontario, Canada; Division of Immunology/Rheumatology, Stanford University, Palo Alto, California, USA; Department of Rheumatology, St. Vincents University Hospital and Conway Institute for Biomolecular Research, University College Dublin, Dublin, Ireland; The Parker Institute, Bispebjerg and Frederiksberg Hospital, The Capital Region of Denmark; Hong Kong Psoriatic Arthritis Association, Hong Kong, China; VU Medical Centre, Amsterdam, the Netherlands; IQVIA, Duke University School of Medicine, Durham, North Carolina, USA; School of Epidemiology, Public Health, and Preventive Medicine, Faculty of Medicine, University of Ottawa, and Ottawa Hospital Research Institute, Clinical Epidemiology Program, Ottawa, Ontario, Canada; Musculoskeletal Health and Outcomes Research, St. Michael's Hospital and Institute for Work and Health, and Department of Occupational Science and Occupational Therapy, Rehabilitation Sciences Institute, and the Institute for Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada; Division of Rheumatology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.+3