[1] Assoc Ceu & Terras, Ave Brasil 7,Apartado 1257, Bissau 1031, Guinea Bissau
[2] INDEPTH Network, Bandim Hlth Project, Apartado 861, Bissau 1004, Guinea Bissau
[3] Odense Univ Hosp, Dept Infect Dis, Sdr Blvd 29, DK-5000 Odense, Denmark
[4] Statens Serum Inst, Artillerivej 5, DK-2300 Copenhagen, Denmark
[5] Aarhus Univ Hosp, Dept Infect Dis, Palle Juul Jensens Blvd 99, DK-8200 Aarhus, Denmark
[6] London Sch Hyg & Trop Med, Keppel St, London WC1E 7HT, England
[7] Royal Infirm Edinburgh NHS Trust, Dept Obstet & Gynaecol, Edinburgh EH16 4SA, Midlothian, Scotland
[8] Univ Melbourne, Doherty Inst, Dept Med, PO Royal Melbourne Hosp, Melbourne, Vic 3050, Australia