[1] Statens Serum Inst, Copenhagen S, Denmark
[2] NCI, NIH, Bethesda, MD 20892 USA
[3] Dept Clin Sci Lund, Rheumatol Sect, Lund, Sweden
[4] Med Prognosis Inst, Horsholm, Denmark
[5] Odense Univ Hosp, Odense C, Denmark
[6] Copenhagen Univ Hosp, Copenhagen, Denmark