1. GlaxoSmithKline R&D, Gunnels Wood Road, Stevenage, Hertfordshire, UK
2. Stanford University, Stanford, California, USA
3. Oxford Centre for Global Health Research, Nuffield Department of Clinical Medicine, Oxford, UK
4. KEMRI-Wellcome Trust Research Programme, Nairobi, Kenya
5. Save the Children UK, London, UK
6. Save the Children International, Kenya Country Office, Nairobi, Kenya
7. Department of Paediatrics and Child Health, University of Nairobi, Nairobi, Kenya
8. Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA