1. Department of Pediatrics, Queen Elizabeth Central Hospital, Blantyre, Malawi
2. Department of Pediatrics, Malawi Liverpool Wellcome Trust Clinical Research Programme, Queen Elizabeth Central Hospital, Blantyre, Malawi
3. Department of Clinical Infection, Microbiology and Immunology, Institute of Infection, Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
4. Department of Pediatrics, Tropical Medicine and Pediatric Infectious Diseases, Baylor College of Medicine, Houston, Texas
5. National School of Tropical Medicine, Baylor College of Medicine, Houston, Texas