Defining Outcome Measures for Psoriatic Arthritis: A Report from the GRAPPA-OMERACT Working Group

From Medicine and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania; University of Utah, Salt Lake City, Utah; QuintilesIMS, Denver, Colorado; Duke University School of Medicine, Durham, North Carolina; Rheumatology Research, Swedish Medical Center; University of Washington School of Medicine, Seattle, Washington; International Dermatology Outcome Measurers, West Granby, Connecticut; Cleveland Clinic, Cleveland, Ohio; Division of Immunology/Rheumatology, Stanford University School of Medicine, Palo Alto, California; Johns Hopkins University School of Medicine; Psoriatic Arthritis Program, Johns Hopkins Arthritis Center, Baltimore, Maryland, USA; VU Medical Centre, Amsterdam, the Netherlands; University of Toronto; Krembil Research Institute; Psoriatic Disease Program, Toronto Western Hospital; Women’s College Research Institute, Women’s College Hospital, Toronto, Ontario, Canada; Hong Kong Psoriatic Arthritis Association, Hong Kong, China; UK National Institute for Health Research (NIHR), Leeds; Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds; Royal United Hospital; Royal United Hospital; Pharmacy and Pharmacology, University of Bath, UK; Newman Clinical Research Professor, St. Vincent’s University Hospital and University College Dublin; Our Lady’s Hospice and Care Services, Dublin, Ireland; Internal Medicine, Division of Rheumatology, Hacettepe University Faculty of Medicine, Ankara, Turkey.