[1] MRC, Ctr Clin Sci, Mol Med Grp, London W12 0NN, England
[2] Hammersmith Hosp, Imperial Coll Genet, London W12 0NN, England
[3] Hammersmith Hosp, Genom Res Inst, London W12 0NN, England
[4] Med Coll Wisconsin, Blood Ctr SE Wisconsin, Milwaukee, WI 53201 USA
[5] Univ London London Sch Hyg & Trop Med, Dept Epidemiol & Populat Sci, London WC1E 7HT, England
[6] MRC Labs, Fajara, Gambia
[7] KEMRI, Coastal Res Unit, Kilifi, Kenya
[8] Univ Oxford, Wellcome Trust Ctr Human Genet, Oxford OX3 7BN, England