[1] Ctr Osped Clin Med, Valeggio Sul Mincio, Italy
[2] Hop Edouard Herriot, Dept Rheumatol & Bone Dis, Lyon, France
[3] Catholic Univ Louvain, Dept Rheumatol, Brussels, Belgium
[4] Railway Hosp, Dept Internal Med, Warsaw, Poland
[5] Univ Hosp, Dept Rheumatol, Amiens, France
[6] Hosp Madeleine, Orleans, France
[7] Odense Univ Hosp, DK-5000 Odense, Denmark
[8] Hop Emile Muller, Mulhouse, France
[9] Univ Hosp, Dept Rheumatol, Caen, France
[10] Univ Liege, Dept Epidemiol & Publ Hlth, B-4000 Liege, Belgium
[11] Hop Cochin, CEMO, F-75674 Paris, France