[1] Univ Amsterdam, Acad Med Ctr, Dept Clin Immunol & Rheumatol, Amsterdam, Netherlands
[2] Acad Med Ctr, Amsterdam Rheumatol & Immunol Ctr, Amsterdam, Netherlands
[3] Acad Med Ctr, Dept Genome Anal, Amsterdam, Netherlands
[4] Amsterdam Rheumatol & Immunol Ctr Reade, Amsterdam, Netherlands
[5] Acad Med Ctr, Dept Clin Epidemiol Biostat & Bioinformat, Amsterdam, Netherlands
[6] Univ Cambridge, Cambridge, England
[7] Univ Ghent, Ghent, Belgium
[8] GlaxoSmithKline, Stevenage, Herts, England
[9] GlaxoSmithKline, Clin Unit Cambridge, Cambridge, England