[1] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, Lung Immunol Grp, Dept Biol Sci,Fac Med, London SW7 2AZ, England
[2] Univ London Imperial Coll Sci Technol & Med, Hammersmith Hosp, Dept Infect Dis, Human Dis Immunogenet Grp, London, England