1. Infectious Diseases Research Collaboration, Kampala, Uganda;
2. Makerere University College of Health Sciences, Kampala, Uganda;
3. National Malaria Control Division, Ministry of Health, Kampala, Uganda;
4. London School of Hygiene and Tropical Medicine, London, United Kingdom;
5. Department of Medicine, University of California San Francisco, San Francisco, California;
6. Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania