[1] Univ Utrecht, Dept Psychol, Heidelberglaan 1, NL-3584 CS Utrecht, Netherlands
[2] Bispebjerg & Frederiksberg Hosp, Parker Inst, Musculoskeletal Stat Unit, Copenhagen, Denmark
[3] Odense Univ Hosp, Dept Rheumatol, Odense, Denmark
[4] Uppsala Univ, Dept Neurosci, Uppsala, Sweden
[5] Hosp Santa Maria, Rheumatol & Metab Bone Dis Dept, Lisbon, Portugal
[6] Univ Lisbon, Lisbon Acad Med Ctr, Inst Med Mol, Fac Med,Rheumatol Res Unit, Lisbon, Portugal
[7] Virginia Mason Med Ctr, Dept Rheumatol, Seattle, WA 98101 USA
[8] Diakonhjemmet Hosp, Norwegian Natl Unit Rehabil Rheumat Patients Spec, NBRR, Oslo, Norway
[9] Maastricht Univ, Dept Rehabil Med, Maastricht, Netherlands
[10] Keele Univ, Res Inst Primary Care & Hlth Sci, Keele, Staffs, England
[11] Haywood Hosp, Haywood Acad Rheumatol Ctr, Stoke On Trent, Staffs, England
[12] Cyprus League Rheumatism, EULAR Patient Res Partner, Nicosia, Cyprus
[13] CHU Clermont Ferrand, Dept Rheumatol, Clermont Ferrand, France
[14] Univ Michigan, Sch Med, Chron Pain & Fatigue Res Ctr, Dept Anesthesiol,Div Pain Res, Ann Arbor, MI USA
[15] EULAR Social Leagues Patients Representat, Leuven, Belgium
[16] Med Univ Vienna, Ctr Med Stat Informat & Intelligent Syst, Sect Outcomes Res, Vienna, Austria
[17] Univ Appl Sci, Dept Hlth Sci, FH Campus Wien, Vienna, Austria
[18] Univ Leuven, Res Grp Hlth Psychol, Leuven, Belgium
[19] Maastricht Univ, Fac Psychol & Neurosci, Behav Med Res, Maastricht, Netherlands
[20] Univ Rey Juan Carlos, Dept Phys Therapy Occupat Therapy Rehabil & Phys, Alcorcon, Spain
[21] Univ Gothenburg, Sahlgrenska Acad, Dept Publ Hlth & Community Med, Primary Hlth Care Unit,Inst Med, Gothenburg, Sweden