[1] Childrens Hosp Philadelphia, Abramson Res Ctr 1102, Joseph Stokes Jr Res Inst,Div Rheumatol, Lab Dendrit Cell Biophys, Philadelphia, PA 19104 USA
[2] Univ Penn, Sch Med, Dept Pediat, Div Rheumatol, Philadelphia, PA 19104 USA
[3] Univ Milan, Fac Psychol, I-20122 Milan, Italy