[1] Univ Libre Bruxelles, Inst Med immunol, B-6041 Charleroi, Belgium
[2] Univ Chicago, Dept Med, Rheumatol Sect, Chicago, IL 60637 USA
[3] Univ Amsterdam, Acad Med Ctr, Dept Pathol, NL-1105 AZ Amsterdam, Netherlands
[4] Univ Chicago, Dept Surg, Sect Transplantat, Chicago, IL 60637 USA