[1] Amsterdam Rheumatol & Immunol Ctr Reade, Dr Jan van Breemenstr 2, NL-1056 AB Amsterdam, Netherlands
[2] Antonius Hosp, Dept Rheumatol, Sneek, Netherlands
[3] Vrije Univ Amsterdam, Dept Internal Med, Med Ctr, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Amsterdam Rheumatol & Immunol Ctr, Med Ctr, Amsterdam, Netherlands
[5] Vrije Univ Amsterdam, Dept Epidemiol & Biostat, Med Ctr, Amsterdam, Netherlands
[6] Amsterdam Rheumatol & Immunol Ctr AMC, Amsterdam, Netherlands