[1] Diakonhjemmet Hosp, Natl Resource Ctr Rehabil Rheumatol, N-0319 Oslo, Norway
[2] Univ Med Ctr Utrecht, Dept Rheumatol & Clin Immunol, Utrecht, Netherlands
[3] Diakonhjemmet Hosp, Dept Rheumatol, N-0319 Oslo, Norway
[4] Copenhagen Univ Hosp Fredriksberg, Parker Inst, Dept Rheumatol, Copenhagen, Denmark
[5] Univ Copenhagen, Dept Nutr Exercise & Sports, Copenhagen, Denmark
[6] Univ Leeds, Div Musculoskeletal Dis, Leeds, W Yorkshire, England
[7] NIHR Leeds Musculoskeletal Biomed Res Unit, Leeds, W Yorkshire, England
[8] Univ Nottingham, Nottingham NG7 2RD, England
[9] Univ Utrecht, Dept Clin & Hlth Psychol, Utrecht, Netherlands
[10] Univ Salford, Ctr Hlth Sci Res, Salford M5 4WT, Lancs, England
[11] Lund Univ, Clin Sci Lund, Dept Orthopaed, Lund, Sweden
[12] Univ Southern Denmark, Inst Sports Sci & Clin Biomech, Res Unit Musculoskeletal Funct & Physiotherapy, Odense, Denmark
[13] Univ Southern Denmark, Dept Orthopaed & Traumatol, Odense, Denmark
[14] Keele Univ, Arthrit Res UK Primary Care Ctr, Keele ST5 5BG, Staffs, England
[15] Univ Studies Milan, Fac Physiotherapy, Milan, Italy
[16] Minerva Hlth Ctr, Preston, Lancs, England
[17] Charles Univ Prague, Fac Med 1, Inst Rheumatol, Prague, Czech Republic
[18] Charles Univ Prague, Fac Med 1, Clin Rheumatol, Prague, Czech Republic
[19] Ctr Hosp Univ Coimbra, Dept Rheumatol, Coimbra, Portugal
[20] Alicante Gen, Dept Rheumatol, Alicante, Spain
[21] Univ Hosp, Alicante, Spain
[22] Univ Ferrara Casa Cura SM Maddalena, Ferrara, Italy
[23] Leiden Univ Med Ctr, Dept Orthopaed, Leiden, Netherlands