Author information:
(1)Sorbonne Universités, UPMC Univ Paris 06, Institut Pierre Louis 
d'Epidémiologie et de Santé Publique, GRC-UPMC 08 (EEMOIS), Paris, France 
Department of rheumatology, AP-HP, Pitié Salpêtrière Hospital, Paris, France.
(2)Division of Rheumatology, Department of Medicine 3, Medical University of 
Vienna, Vienna, Austria Second Department of Medicine, Hietzing Hospital, 
Vienna, Austria.
(3)Department of Rheumatology, Leiden University Medical Centre, Leiden, The 
Netherlands.
(4)EULAR, representing People with Arthritis/Rheumatism in Europe (PARE), 
London, UK.
(5)Research Laboratory and Clinical Division of Rheumatology, Department of 
Internal Medicine, University of Genova, Viale Benedetto, Italy.
(6)Medicine Faculty, Paris Descartes University, Paris, France Rheumatology B 
Department, APHP, Cochin Hospital, Paris, France.
(7)Leeds NIHR Musculoskeletal Biomedical Research Unit, LTHT, Leeds, UK Leeds 
Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, 
UK.
(8)Department of Clinical Immunology & Rheumatology, Amsterdam Rheumatology 
Center, Amsterdam, The Netherlands Atrium Medical Center, Heerlen, The 
Netherlands.
(9)North Devon, UK.
(10)Division of Rheumatology, Department of Medicine 3, Medical University of 
Vienna, Vienna, Austria.
(11)Rheumazentrum Ruhrgebiet, Herne and Ruhr-Universität Bochum, Herne, Germany.
(12)Department of Rheumatology and Clinical Immunology, Charité-University 
Medicine Berlin, Germany.
(13)Arthritis Unit, Department of Rheumatology, Hospital Clínic and IDIBAPS, 
Barcelona, Spain.
(14)Belgrade University School of Medicine, Belgrade, Serbia.
(15)Department of Rheumatology, St. Vincent's University Hospital and Conway 
Institute, University College Dublin, Dublin, Ireland.
(16)Section of Rheumatology, Department of Clinical Sciences, Lund University, 
Lund, Sweden Sweden and School of Business, Engineering and Science, Halmstad 
University, Halmstad, Sweden.
(17)Section of Musculoskeletal Disease, Leeds Institute of Molecular Medicine, 
University of Leeds, Leeds, UK.
(18)Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway.
(19)Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and 
Engineering Research Center, KU Leuven, Belgium Division of Rheumatology, 
University Hospitals Leuven, Leuven, Belgium.
(20)Department of Dermatology, University Hospital Münster, Münster, Germany.
(21)A.DI.PSO. (Associazione per la Difesa degli Psoriasici)-PE.Pso.POF (Pan 
European Psoriasis Patients' Organization Forum), Rome, Italy.
(22)Institute of Infection, Immunity and Inflammation, University of Glasgow, 
Glasgow, UK.
(23)Rheumatology Department of Lucania, San Carlo Hospital of Potenza and 
Madonna delle Grazie Hospital of Matera, Potenza, Italy.
(24)Institute and Clinic of Rheumatology Charles University Prague, Czech 
Republic.
(25)Department of Internal Medicine 3, University of Erlangen-Nuremberg, 
Erlangen, Germany.
(26)Department of Rheumatology, Campus Benjamin Franklin, Charité, Berlin, 
Germany.
(27)Ghent University Hospital, Ghent, Belgium.
(28)Centre for Arthritis and Rheumatic Disease, Dublin Academic Medical Centre, 
St. Vincent's University Hospital, Dublin, Ireland.
(29)Schoen Klinik Hamburg, Rheumatology and Clinical Immunology, Hamburg, 
Germany.
(30)Department of Rheumatology and Clinical Immunology, German Rheumatism 
Research Centre Berlin, Charité-University Medicine Berlin, Germany.