[1] Barts & London, Ctr Hlth Sci, London, England
[2] Univ London Imperial Coll Sci & Technol, Wellcome Ctr Trop Med, London, England
[3] Univ Cape Town, Inst Infect Dis & Mol Med, ZA-7700 Rondebosch, South Africa
[4] McGill Univ, Dept Med, Montreal, PQ H3A 2T5, Canada
[5] Univ London Imperial Coll Sci & Technol, Natl Heart & Lung Inst, Dept Resp Med, London, England
[6] Newham Chest Clin, London, England
[7] Northwick Pk Hosp & Clin Res Ctr, TB Clin, London, England
[8] Northwick Pk Hosp & Clin Res Ctr, Dept Clin Biochem, London, England