[1] Univ Dusseldorf, Dept Gastroenterol Hepatol & Infect Dis, D-40225 Dusseldorf, Germany
[2] Univ Essen Gesamthsch, Inst Immunol, Essen, Germany
[3] Ontario Canc Inst, Campbell Inst Breast Canc Res, Toronto, ON M4X 1K9, Canada
[4] Univ Alabama Birmingham, Dept Pathol, Birmingham, AL 35294 USA
[5] Univ Freiburg, Inst Med Microbiol & Hyg, D-79106 Freiburg, Germany
[6] Yale Univ, Sch Med, Dept Immunbiol, New Haven, CT USA
[7] Univ Toronto, Dept Immunol, Toronto, ON, Canada