[1] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[2] Hosp Southern Norway Trust, Div Rheumatol, Dept Internal Med, Kristiansand, Norway
[3] Med Univ Vienna, Div Rheumatol, Dept Med 3, Vienna, Austria
[4] Med Univ Vienna, Vienna, Austria
[5] ZiteLab ApS, Copenhagen, Denmark
[6] Leiden Univ, Med Ctr, Leiden, Netherlands
[7] DANBIO Registry, Copenhagen Ctr Arthrit Res, Ctr Rheumatol & Spine Dis, Glostrup, Denmark
[8] Univ Copenhagen, Copenhagen, Denmark