[1] Univ London Imperial Coll Sci Technol & Med, Antigen Presentat Res Grp, London, England
[2] St Marks Hosp, Dept Surg, Harrow, Middx, England
[3] Queen Mary Univ, Ctr Digest Dis, Blizard Inst Cell & Mol Sci, Barts & London Sch Med & Dent, London, England
[4] Unilever SEAC, Bedford, England
[5] Queen Mary Univ, Ctr Immunol & Infect Dis, Blizard Inst Cell & Mol Sci, Barts & London Sch Med & Dent, London, England