1. a Family and Community Medicine , University of California , San Francisco , CA , USA
2. b Child Health and Development Centre, College of Health Sciences , Makerere University , Kampala , Uganda
3. c Epidemiology and Biostatistics , University of California , San Francisco , CA , USA
4. d Baylor College of Medicine Children's Foundation , Kampala , Uganda
5. e The New Paradigm Research Fund , Washington , DC , USA