机构:
Boston Univ, Sch Med, Rheumatol Sect, Boston, MA 02118 USA
Univ Manchester, Arthrit Res UK Epidemiol Unit, Manchester, Lancs, England
Univ Manchester, Natl Inst Hlth Res, Biomed Res Ctr, Manchester, Lancs, EnglandDiakonhjemmet Hosp, Rheumatol, Oslo, Norway