1. KEMRI/Wellcome Trust Research Programme, Kilifi, Kenya.
2. Kilifi District Hospital, Kilifi, Kenya.
3. Centre for Clinical Vaccinology and Tropical Medicine, University of Oxford, Oxford, United Kingdom.
4. PharmAccess Foundation, Amsterdam, The Netherlands.
5. Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
6. Health Protection Agency, London, United Kingdom.