[1] Diakonhjemmet Hosp, Ctr Treatment Rheumat & Musculoskeletal Dis REMED, Oslo, Norway
[2] Univ Oslo, Fac Med, Oslo, Norway
[3] Oslo Univ Hosp, Clin Trial Unit, Oslo, Norway
[4] Alesund Hosp, Dept Rheumatol, Helse More Romsdal HF, Alesund, Norway
[5] Revmatismesykehuset AS, Dept Rheumatol, Lillehammer, Norway
[6] Haukeland Hosp, Dept Rheumatol, Bergen, Norway
[7] Hosp Ostfold HF, Dept Rheumatol, Moss, Norway
[8] Univ Hosp North Norway, Dept Rheumatol, Tromso, Norway
[9] Drammen Hosp, Dept Rheumatol, Vestre Viken HF, Drammen, Norway
[10] Sorlandet Hosp HF, Dept Rheumatol, Kristiansand, Norway
[11] Helgelandssykehuset Mo I Rana, Dept Rheumatol, Mo I Rana, Norway
[12] Martina Hansens Hosp, Dept Rheumatol, Baerum, Norway
[13] Brigham & Womens Hosp, Div Rheumatol, Boston, MA USA
[14] Leiden Univ, Dept Rheumatol, Med Ctr, Leiden, Netherlands