[1] Univ Michigan, Dept Surg, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Microbiol, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Immunol, Ann Arbor, MI 48109 USA
[4] Charles Univ Prague, Sch Med, Dept Allergy & Clin Immunol, Hradec Kralove, Czech Republic
[5] Mayo Clin, Coll Med, Dept Surg, Rochester, MN USA