[1] Univ Birmingham, Sch Immun & Infect, Birmingham, W Midlands, England
[2] Univ Hosp Birmingham NHS Fdn Trust, Wellcome Trust CRF, Birmingham, W Midlands, England
[3] Univ Zurich Hosp, Div Clin Immunol, CH-8091 Zurich, Switzerland
[4] Klinikum Offenbach, Dept Med, Offenbach, Germany
[5] Addenbrookes Hosp, Cambridge, England