1. Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, USA
2. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
3. Centre for Microbiologic Research, Kenya Medical Research Institute, Nairobi, Kenya
4. Center for Global Health Sciences, University of California, San Francisco, CA, USA
5. School of Medicine, University of California, San Francisco, CA, USA
6. Departments of Obstetrics and Gynecology and Global Health, University of Washington, Seattle, WA, USA
7. Departments of Epidemiology, Global Health, and Medicine, University of Washington, Seattle, WA, USA
8. Departments of Epidemiology and Biostatistics and Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, CA, USA