[1] Univ Paris 05, Hop Cochin, Inst Rhumatol, Serv Rhumatol B, F-75014 Paris, France
[2] Univ Nottingham, City Hosp, Nottingham NG5 1PB, England
[3] Musgrave Pk Hosp, Belfast, Antrim, North Ireland
[4] Southampton Gen Hosp, MRC, Epidemiol Unit, Southampton SO16 6YD, Hants, England
[5] Univ Bordeaux 2, Lab Therapeut, F-33076 Bordeaux, France
[6] Acad Ziekenhuis Utrecht, Afdeling Reumatol & Klin Immunol, NL-3508 GA Utrecht, Netherlands
[7] Univ London St Georges Hosp, Sch Med, Hlth Care Evaluat Unit, London SW17 0RE, England
[8] Univ Bristol, MRC Hlth Serv Res, Bristol BS8 2PR, Avon, England
[9] Ortho Klin RKU, D-89081 Ulm, Germany
[10] Ctr Rheumatol & Bone, Klin Pk, Hirslandengrp, CH-8038 Zurich, Switzerland
[11] Hop Conception, Serv Rhumatol, Madrid 28040, Spain
[12] Stockerau Hosp, Lower Austrian Ctr Rheumatol, A-2000 Stockerau, Austria
[13] Univ Lund Hosp, Dept Orthopaed, S-22185 Lund, Sweden
[14] CHU Rangueil, Serv Rhumatol, F-31054 Toulouse, France
[15] Hosp La Paz, Serv Reumatol, Madrid 28046, Spain
[16] Inst Rheumatol, Prague 12850 2, Czech Republic
[17] Ist Ortoped Toscano, Div Reumatol, Florence, Italy
[18] Waldkrankenhaus St Marian, Orthopad Univ Klin & Poliklin, Abt Rheuhopad Rheumatol, D-91054 Erlangen, Germany
[19] Univ Zuikenhuis, Rheumatol Unit, B-9000 Ghent, Belgium
[20] Karol Marcinskowski Univ Med Sci Poznan, Dept Rheumatol Rehabil, PL-61545 Poznan, Poland