[1] UCL, Ctr Rheumatol, London WC1E 6BT, England
[2] EMD Serono Inc, R&D Global BioStat, Billerica, MA USA
[3] EMD Serono Inc, Global Clin Dev, Rockland, MA USA
[4] Univ Calif San Francisco, Rosalind Russell Med Res Ctr Arthrit, San Francisco, CA 94143 USA
[5] Univ Birmingham, Sch Immun & Infect, Birmingham B15 2TT, W Midlands, England