[1] Diakonhjemmet Hosp, Dept Rheumatol, Prevent Cardiorheuma Clin, Oslo, Norway
[2] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[3] NS Fdn Trust, Dudley Grp Hosp, Dept Rheumatol, Dudley, England
[4] Radboud Hosp, Dept Rheumatol, Nijmegen, Netherlands
[5] Mayo Clin, Hlth Sci Res, Rochester, MN USA
[6] Trinity Coll Dublin, Dublin, Ireland