[1] Univ Leeds, Acad Unit Musculoskeletal Dis, Leeds, W Yorkshire, England
[2] Natl Inst Rheumatism & Physiotherapy, Rheumatol Dept 3, Budapest, Hungary
[3] Univ Copenhagen, Copenhagen, Denmark
[4] Hvidovre Univ Hosp, Copenhagen, Denmark
[5] Univ Ancona, Dept Rheumatol, Jesi, Italy
[6] Charite Hosp, Dept Rheumatol, Berlin, Germany
[7] Cochin Hosp, Div Rheumatol, Paris, France
[8] Univ Paris 05, Paris, France
[9] Severo Ochoa Hosp, Dept Rheumatol, Madrid, Spain
[10] Univ Roma La Sapienza, Rheumatol Unit, Rome, Italy
[11] BerlinBuch, Med Ctr Rheumatol, Berlin, Germany
[12] Med Ctr Leeuwarden, Leeuwarden, Netherlands
[13] Univ Newcastle, Newcastle Upon Tyne, Tyne & Wear, England
[14] Leeds Gen Infirm, Dept Radiol, Leeds, W Yorkshire, England
[15] Univ Erlangen Nurnberg, Dept Rheumatol, Erlangen, Germany
[16] St George Hosp, Sydney, NSW, Australia
[17] Univ New S Wales, Sydney, NSW, Australia
[18] Mikkeli Cent Hosp, Mikkeli, Finland
[19] Hosp Westfries Gasthuis, Dept Rheumatol, Hoorn, Netherlands
[20] Univ Vienna, Vienna, Austria
[21] Univ Innsbruck Hosp, Dept Radiol 2, A-6020 Innsbruck, Austria
[22] Univ Vienna, Div Rheumatol, Dept Internal Med 3, Vienna, Austria