[1] Vrije Univ Amsterdam, Med Ctr, Rheumatol & Immunol Ctr, NL-1007 MB Amsterdam, Netherlands
[2] Reade, Amsterdam Rheumatol & Immunol Ctr, NL-1040 HG Amsterdam, Netherlands
[3] Dudley Grp NHS Fdn Trust, Russells Hall Hosp, Clin Res Unit, Dept Rheumatol, Dudley DY1 2HQ, England
[4] Dudley Grp NHS Fdn Trust, Russells Hall Hosp, Clin Res Unit, Res & Dev Directorate, Dudley DY1 2HQ, England