[1] Univ Toronto, Dept Rheumatol, Toronto, ON, Canada
[2] Univ Western Ontario, St Josephs Hlth Ctr, London, ON N6A 4V2, Canada
[3] Univ Texas, SW Med Ctr, Dallas, TX USA
[4] Gen Infirm, Dept Rheumatol, Leeds LS1 3EX, W Yorkshire, England
[5] Baylor Univ, Med Ctr, Ctr Arthritis, Dallas, TX USA
[6] Hop Cochin, Dept Rheumatol, F-75674 Paris, France
[7] St Louis Univ, Dept Internal Med, St Louis, MO 63103 USA
[8] Johns Hopkins Univ, Div Rheumatol, Baltimore, MD USA
[9] Roche Prod Ltd, Welwyn Garden City AL7 3AY, Herts, England
[10] Biogen Idec, San Diego, CA USA