[1] Univ Seville, Hlth & Terr Res HTR, Seville, Spain
[2] Spanish Federat Spondyloarthrit Patient Assoc CEA, Madrid, Spain
[3] Hosp Univ La Paz, IdiPaz, Rheumatol Dept, Madrid, Spain
[4] Sanatorio Julio Mendez, Rheumatol Dept, Buenos Aires, DF, Argentina
[5] Cardiff Univ, Rheumatol Dept, Cardiff, Wales
[6] Cyprus League Rheumatism, Patient Advocacy, Nicosia, Cyprus
[7] Mumbai Arthrit Clin, Rheumatol Dept, Mumbai, Maharashtra, India
[8] Axial Spondyloarthrit Int Federat ASIF, Patient Advocacy, London, England
[9] Canadian Spondylitis Assoc CSA, Patient Advocacy, Toronto, ON, Canada
[10] Charite Univ Med Berlin, Rheumatol Dept, Berlin, Germany
[11] German Rheumatism Res Ctr, Rheumatol Dept, Berlin, Germany