[1] Geneva Univ Hosp, Div Rheumatol, Geneva, Switzerland
[2] Eli Lilly Suisse SA, Med Dept, Vernier, Switzerland
[3] Rheumazentrum Ostschweiz, St Gallen, Switzerland
[4] Univ Manchester, Ctr Epidemiol Versus Arthrit, Ctr Musculoskeletal Res, Manchester, Lancs, England