[1] Univ Seville, Hlth & Terr Res HTR, Seville, Spain
[2] Spanish Federat Spondyloarthrit Assoc, Madrid, Spain
[3] Univ Hosp La Paz, IdiPAZ, Madrid, Spain
[4] Cardiff Univ, Cardiff, Wales
[5] Axial Spondyloarthrit Int Federat ASIF, London, Spain
[6] Cyprus League Rheumatism, Nicosia, Cyprus
[7] Novartis Pharma AG, Basel, Switzerland
[8] Charite Univ Med Berlin, Berlin, Germany
[9] German Rheumatism Res Ctr, Berlin, Germany