[1] MRC Versus Arthrit Ctr Musculoskeletal Hlth & Wor, Occupat Rheumatol, Southampton, Hants, England
[2] MRC Versus Arthrit Ctr Musculoskeletal Hlth & Wor, Southampton, Hants, England
[3] Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[4] Southampton Gen Hosp, Southampton SO16 6YD, Hants, England
[5] Sch Med, Aberdeen, Scotland
[6] Aberdeen Ctr Arthrit & Musculoskeletal Hlth, Aberdeen, Scotland