[1] Univ Seville, Hlth & Terr Res HTR, Seville, Spain
[2] Spanish Federat Spondyloarthritis Assoc CEADE, Madrid, Spain
[3] Axial Spondyloarthritis Int Federat ASIF, London, England
[4] Novartis Pharm AG, Basel, Switzerland
[5] NIHR Leeds Biomed Res Ctr, Leeds Teaching Hosp Trust, Leeds, England
[6] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, England
[7] La Paz Univ Hosp, IdiPaz, Madrid, Spain