[1] Univ Seville, Seville, Spain
[2] Spondyloarthrit Assoc, Madrid, Spain
[3] Hosp La Paz, Madrid, Spain
[4] Sorbonne Univ, Paris, France
[5] Cardiff Univ, Cardiff, S Glam, Wales
[6] Ankylosing Spondylitis Int Federat, London, England
[7] Cyprus League Rheumatism, Nicosia, Cyprus
[8] Charite Univ Med Berlin, Berlin, Germany
[9] German Rheumatism Res Ctr, Berlin, Germany