[1] Univ Nottingham, Nottingham, England
[2] Univ Messina, Rheumatol Unit, Messina, Italy
[3] Univ Nova Lisboa, CEDOC 3, NOVA Med Sch, Fac Ciencias Med, Lisbon, Portugal
[4] Hosp Egas Moniz CHLO 7, Rheumatol Dept, Lisbon, Portugal
[5] Ben Gurion Univ Negev, Beer Sheva, Israel
[6] Michigan Med, Ann Arbor, MI USA
[7] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[8] McGill Univ, Montreal, PQ, Canada
[9] Johns Hopkins Univ, Baltimore, MD USA
[10] Karolinska Inst, Stockholm, Sweden
[11] Univ Aberdeen, Aberdeen, Scotland
[12] Primary Integrated Community Serv Ltd, Nottingham, England
[13] Univ Wisconsin, Madison, WI USA
[14] Midlands NHS Fdn Trust, Stoke On Trent, Staffs, England
[15] Keele Univ, Stoke On Trent, Staffs, England
[16] Ctr Hosp & Univ Coimbra 9, Rheumatol Dept, Coimbra, Portugal
[17] Cardiff Univ, Sch Med, Cardiff, Wales
[18] Univ Washington, Sch Med, Seattle, WA USA
[19] Univ Aberdeen, Ann Arbor, MI USA
[20] Univ Nottingham, Sch Med, Acad Rheumatol, Nottingham, England