[1] Ctr Hosp & Univ Coimbra, Rheumatol Dept, Coimbra, Portugal
[2] Univ Coimbra, Fac Med, Coimbra Inst Clin & Biomed Res iCBR, Coimbra, Portugal
[3] Dept Psychol Hlth & Technol, Enschede, Netherlands
[4] Univ Twente, Stichting Tools Patient Empowerment, Amsterdam, Netherlands
[5] Univ Amsterdam, Dept Med Humanities, Med Ctr, Amsterdam, Netherlands
[6] Ctr Hosp Univ Algarve, Dept Rheumatol, Faro, Portugal
[7] Lisbon Acad Med Ctr, Lisbon, Portugal
[8] Algarve Biomed Ctr, Faro, Portugal
[9] Charite Univ Med Berlin, Dept Rheumatol & Clin Immunol, Berlin, Germany
[10] Univ Genoa, IRCCS Polyclin Hosp San Martino, Res Lab, Genoa, Italy
[11] Univ Genoa, IRCCS Polyclin Hosp San Martino, Acad Div Clin Rheumatol, Dept Internal Med, Genoa, Italy
[12] Univ Estado Rio De Janeiro, Med Sci Sch, Discipline Rheumatol, Rio De Janeiro, Brazil
[13] Vrije Univ, Amsterdam Univ, Amsterdam Rheumatol & Immunol Ctr, Dept Epidemiol & Biostat,Med Ctr, Amsterdam, Netherlands