[1] Univ Amsterdam, AMC, Div Clin Immunol & Rheumatol, NL-1012 WX Amsterdam, Netherlands
[2] Univ Amsterdam, AMC, Dept Cell Biol & Histol, NL-1012 WX Amsterdam, Netherlands
[3] Univ Penn, Philadelphia, PA 19104 USA
[4] Yale Univ, Sch Med, New Haven, CT USA