[1] London Sch Hyg & Trop Med, Dept Global Hlth & Dev, 15-17 Tavistock Pl, London WC1H 9SH, England
[2] KEMRI Wellcome Trust Res Programme, Hlth Econ Res Unit, POB 43640 00100,197 Lenana Pl,Off Lenana Rd, Nairobi, Kenya
[3] Univ Rwanda, Sch Publ Hlth, Remera Campus,POB 3286,Kigali KG 11 Ave, Kigali, Rwanda
[4] South African Med Res Council, Hlth Syst Res Unit, Francie Van Zyl Dr, ZA-7503 Cape Town, South Africa
[5] Kintampo Hlth Res Ctr, POB 200, Kintampo North Municipal, Ghana
[6] Aga Khan Univ, Sch Nursing & Midwifery & Community Hlth Sci, Natl Stadium Rd, Karachi 74800, Pakistan
[7] Natl Inst Publ Adm, POB 31990 Plot 4810,Dushanbe Rd, Lusaka, Zambia
[8] Univ Oxford, Nuffield Dept Med, Henry Wellcome Bldg Mol Physiol,Old Rd Campus, Oxford OX3 7BN, England
[9] South African Med Res Council, Gender & Hlth Res Unit, 1 Soutpansberg Rd, Pretoria, South Africa