1. Department of Medicine, Stanford University , Stanford, CA 94305 , USA
2. Infectious Diseases Research Collaboration , Kampala , Uganda
3. Institute for Immunity, Infection, and Transplantation, Stanford University , Stanford, CA 94305 , USA
4. Department of Medicine, University of California , San Francisco, CA 94142 , USA
5. School of Medicine, Makerere University , Kampala , Uganda
6. Department of Pediatrics, University of California , San Francisco, CA 94142 , USA