[1] Washington Univ, Sch Med, Howard Hughes Med Inst, Div Rheumatol,Dept Med, St Louis, MO 63110 USA
[2] Washington Univ, Sch Med, Howard Hughes Med Inst, Div Rheumatol,Dept Pathol & Immunol, St Louis, MO 63110 USA
[3] Washington Univ, Sch Med, Dept Pediat, St Louis, MO 63110 USA