[1] Natl Univ Ireland, Mol Evolut & Systemat Lab, Dept Zool, Martin Ryan Inst,Sch Nat Sci, Galway, Ireland
[2] Univ Western Cape, S African Natl Bioinformat Inst, ZA-7535 Bellville, South Africa
[3] Karonga Prevent Study, Chilumba, Malawi
[4] London Sch Hyg & Trop Med, Dept Epidemiol & Populat Hlth, London WC1, England