[1] Oxford Univ Hosp NHS Trust, Oxford, England
[2] Whately Smith Ltd, Kings Langley, England
[3] Bath Inst Rheumat Dis, Bath, Avon, England
[4] Rheumazentrum Ruhrgebiet, Herne, Germany
[5] Univ Molise, Acad Rheumatol Unit, Dipartimento Med & Sci Salute Vincenzo Tiberio, Campobasso, Italy
[6] Univ Oviedo, Fac Med, Rheumatol Serv, Oveido, Spain
[7] Univ Oviedo, Principal Asturias Inst Hlth Res ISPA, Oveido, Spain
[8] Rheumatol Schwerpunktpraxis, Berlin, Germany
[9] Lucania San Carlo Hosp Potenza, Rheumatol Dept, Potenza, Italy
[10] Univ Pisa, Pisa, Italy
[11] Le Mans Gen Hosp, Le Mans, France
[12] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[13] Kellgren Ctr Rheumatol, Manchester, Lancs, England
[14] Paracelsus Univ Nurnberg, Erlangen, Germany
[15] Hosp Univ 12 Octubre, Madrid, Spain
[16] Goethe Univ Frankfurt, Rheumatol, Frankfurt, Germany
[17] Complejo Asistencial Univ Salamanca, Salamanca, Spain
[18] Univ Nottingham, Stafford, England
[19] SERGAS, La Coruna, Spain
[20] Hosp Clin Barcelona, Barcelona, Spain
[21] CHU Toulouse, Toulouse, France
[22] Sapienza Univ Rome, Dept Clin Internal Anesthesiol & Cardiovasc Sci, Rheumatol Unit, Rome, Italy
[23] Bradford Teaching Hosp NHS Fdn trust, Bradford, W Yorkshire, England
[24] GBR, Planegg, Germany
[25] Aix Marseille Univ, Marseille, France
[26] Sorbonne Univ, Paris, France
[27] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England