1. International Health, Johns Hopkins Bloomberg School of Public Health , 615 North Wolfe Street, Baltimore, MD 21205, USA
2. Health Programme, UNICEF New York , 3 UN Plaza, New York, NY 10017, USA
3. Centre for Social Research, University of Malawi , P.O. Box 280, Zomba, Malawi
4. KEMRI-Wellcome Trust Research Programme , Hospital Road, P.O. Box 230, Kilifi, Kenya
5. School of Public Health, Makerere University , New Mulago Hill Road, Mulago, Kampala, Uganda
6. UNICEF Malawi , PO Box 30375, Airtel Complex Area 40/31, Lilongwe, Malawi
7. Health Section, UNICEF Eastern and Southern Africa Regional Office , United Nations Complex, Gigiri, P.O. Box 44145-00100, Nairobi, Kenya