1. Paediatrics and Child Health Research Group, Malawi-Liverpool Wellcome Trust Clinical Research Programme, Blantyre, Malawi
2. Department of Paediatrics, University of Malawi College of Medicine, Blantyre, Malawi
3. Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, UK
4. Department of Paediatrics, Stellenbosch University, Stellenbosch, South Africa
5. Department of Microbiology, Korle-Bu Teaching Hospital and University of Ghana Medical School, Accra, Ghana
6. Department of Paediatrics, University of Zimbabwe College of Health Sciences, Harare, Zimbabwe
7. Department of Paediatrics, University College Hospital and University of Ibadan College of Medicine, Ibadan, Nigeria